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1.
Am Surg ; : 31348211047467, 2021 Oct 13.
Artigo em Inglês | MEDLINE | ID: mdl-34645329

RESUMO

INTRODUCTION: There is a growing concern that certain public health restrictions imposed to prevent the spread of coronavirus disease 2019 (COVID-19) could result in more violence against women (VAW). We sought to determine if the rates and types of VAW changed during the COVID-19 pandemic at our level 1 trauma center (L1TC). METHODS: We performed a retrospective review of female patients who presented to our L1TC because of violence from 2019 through 2020. Patients were grouped into a pre-COVID or COVID period. The primary aim of this study was to compare rates of VAW between groups. Secondary aims sought to evaluate for any difference in traumatic mechanism between periods and to determine if a temporal relationship existed between COVID-19 and VAW rates. RESULTS: There was no difference in rates of VAW between the pre-COVID and COVID period (3.1% vs 3.6%, P = .6); however, rates of penetrating trauma were greater during the COVID period (38.2% vs 10.3%, P = .01). After controlling for patient age and race, the odds of penetrating trauma increased during the pandemic (OR 5.8, 95% CI 1.6-28.5, P < .01). From February 2020 through October 2020, there was a direct relationship between rates of COVID-19 and VAW (r2 .78, P < .01). CONCLUSION: Rates of VAW were unchanged between the pre-COVID and COVID periods, yet the odds of penetrating VAW were 5 times greater during the pandemic. Moving forward, trauma surgeons must remain vigilant for signs of violence and ensure that support services are available during future crises.

3.
Zhonghua Yi Xue Za Zhi ; 101(4): 254-258, 2021 Jan 26.
Artigo em Chinês | MEDLINE | ID: mdl-33486933

RESUMO

Objective: To explore the value of neuroendoscopy combined with fluorescence angiography in anterior circulation aneurysm clipping. Methods: A total of 15 patients with anterior circulation aneurysm from Department of Neurosurgery, Zhongnan Hospital of Wuhan University between October 2018 and January 2019 were enrolled. Neuroendoscopy combined with indocyanine green fluorescence angiography (ICGA) was used to determine the shape of the aneurysm, the specific location of the aneurysm neck and its relationship with the aneurysm-bearing artery during anterior circulation aneurysm clipping. Meanwhile, Neuroendoscopy combined with ICGA can be employed to observe whether there was stenosis and incomplete clamping of the aneurysm-bearing artery after clipping the aneurysm, and whether there was misclamping of the perforating branches hidden under the posterior wall of the aneurysm. Results: The success rate of aneurysm clipping in 15 cases was 15/15. After aneurysm clipping, ICGA and neuroendoscopy were performed. The residual aneurysm neck was detected in 3 cases, and the position of aneurysm clip was adjusted or aneurysm clips were added. In one case, the anterior choroidal aneurysm was found to be mistakenly clipped. After adjusting the aneurysm clip, ICGA and neuroendoscopy showed that the anterior choroidal artery was normal. In another case, the A1 segment aneurysm was clipped. ICGA and neuroendoscopy found that the perforating branch blood vessels were mistakenly clipped. After the adjustment of the aneurysm clip, the blood vessels recovered their patency. There were no surgical-related deaths, disability and coma cases in the study. Conclusions: During aneurysm clipping, neuroendoscopy combined with ICGA can reduce cerebral vasospasm, decrease the misclipping rate of perforation of blood vessels, and avoid residual neck of aneurysm, stenosis or occlusion of aneurysm-bearing artery by using neuroendoscopy to observe whether misclipping of the perforating branch vessels exist and whether the aneurysm is clipped. Therefore, it can reduce postoperative complications.


Assuntos
Aneurisma Intracraniano , Neuroendoscopia , Angiografia Cerebral , Angiofluoresceinografia , Humanos , Aneurisma Intracraniano/diagnóstico por imagem , Aneurisma Intracraniano/cirurgia , Procedimentos Neurocirúrgicos , Instrumentos Cirúrgicos
4.
J Surg Res ; 257: 519-528, 2021 01.
Artigo em Inglês | MEDLINE | ID: mdl-32919342

RESUMO

BACKGROUND: Cholecystectomy is considered a low-risk procedure with proven safety in many high-risk patient populations. However, the risk of cholecystectomy in patients with active cancer has not been established. METHODS: The American College of Surgeons National Surgical Quality Improvement Program (ACS NSQIP) database was queried to identify all patients with disseminated cancer who underwent cholecystectomy from 2005 to 2016. Postcholecystectomy outcomes were defined for patients with cancer and those without by comparing several outcomes measures. A multivariate model was used to estimate the odds of 30-d mortality. RESULTS: We compared outcomes in 3097 patients with disseminated cancer to a matched cohort of patients without cancer. Patients with cancer had more comorbidities at baseline: dyspnea (10.5% versus 7.0%, P < 0.0001), steroid use (10.1% versus 3.0%, P < 0.0001), and loss of >10% body weight in 6-mo prior (9.3% versus 1.6%, P < 0.0001). Patients with cancer sustained higher rates of wound (2.3% versus 5.6%, P < 0.0001), respiratory (1.4% versus 3.9%, P < 0.0001), and cardiovascular (2.0% versus 6.8%, P < 0.0001) complications. In addition, patients with disseminated cancer experienced a longer length of stay and higher 30-d mortality. Multivariate modeling showed that the odds of 30-d mortality was 3.3 times greater in patients with cancer. CONCLUSIONS: Compared to patients without cancer, those with disseminated cancer are at higher risk of complication and mortality following cholecystectomy. Traditional treatment algorithms should be used with caution and care decisions individualized based on the patient's disease status and treatment goals.


Assuntos
Colecistectomia Laparoscópica/mortalidade , Colecistite/cirurgia , Neoplasias/complicações , Complicações Pós-Operatórias/epidemiologia , Adolescente , Adulto , Idoso , Idoso de 80 Anos ou mais , Colecistite/complicações , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Complicações Pós-Operatórias/etiologia , Melhoria de Qualidade , Estudos Retrospectivos , Medição de Risco , Estados Unidos/epidemiologia , Adulto Jovem
5.
Surg Endosc ; 35(10): 5774-5786, 2021 10.
Artigo em Inglês | MEDLINE | ID: mdl-33051765

RESUMO

BACKGROUND: Our group has previously demonstrated that low socioeconomic status (SES) independently predicts ≤ 25th percentile weight-loss following bariatric surgery (BS). Given that sociodemographic metrics can be separated into income, education, and race, we sought to investigate how each metric independently impacted weight loss following BS. METHODS: Patients from a single academic institution who underwent bariatric surgery from 2014 to 2016 were retrospectively reviewed. Patients were stratified by income (low/high), education (≤ high school/ ≥ college), and race (black/white) then compared using univariate analysis. Variables significant on univariate analyses were subsequently used for a greedy 1:3 propensity score match with a caliper of 0.2. After matching, groups were balanced on demographics, social/medical/psychological history, and surgery type. Percent excess body weight loss for each post-operative time point was compared using appropriate univariate analyses. A p-value ≤ 0.05 was considered statistically significant. RESULTS: 571 patients were included. Unmatched race analysis demonstrated black patients were significantly younger (p = 0.05), single (p < 0.0001), in a lower income bracket (p < 0.0001), and experienced less weight loss at 2- (p = 0.01), 6- (p = 0.007), 12- (p = 0.008) and 24- (p = 0.007) months post-op. After matching, black patients continued to experience less weight loss at 2- (p = 0.01) and 6- (p = 0.03) months, which trended at 1 year (p = 0.06). Initial income analysis demonstrated patients in the low-income group (LIG) were more likely to be black (p < 0.0001), have ≤ high school education (p = 0.004), a higher preoperative BMI (p = 0.008), and lower postoperative weight loss at 2- (p = 0.001), 6- (p = 0.01), and 12- (p = 0.04) months after surgery. After matching, no differences were observed up to 3-years post-op. Analysis of education demonstrated no effect on weight loss in both unmatched and matched analyses. CONCLUSION: Unmatched analysis demonstrated that low income and race impact short-term weight loss after BS. After matching, however, race, not socioeconomic status, predicted weight loss outcomes up to 1-year.


Assuntos
Cirurgia Bariátrica , Obesidade Mórbida , Índice de Massa Corporal , Humanos , Obesidade Mórbida/cirurgia , Estudos Retrospectivos , Perda de Peso
6.
Biomed J ; 2021 Dec 30.
Artigo em Inglês | MEDLINE | ID: mdl-34974168

RESUMO

BACKGROUND: Current methods of measuring the phosphorylated-Ser129-α-synuclein (p-Ser129-α-syn) concentration in CSF for Parkinson's disease (PD) are based on ELISA method. However, analyses have revealed p-Ser129-α-syn measured by ELISA to diagnose PD was AUC in 0.7-0.8. Higher confidence level of AUC in clinical PD diagnosis was developed that allows us to measure p-Ser129-α-syn in diluted human serum sample for the early diagnosis of PD. A specific biomarker of p-Ser129-α-syn in diluted human serum for reliable diagnosis of PD was investigated. MATERIAL AND METHODS: A modified paired surface plasma wave biosensor was set up. The method combining an immunoassay and non-labeled technique measures the p-Ser129-α-syn level in diluted human serum with high sensitivity and specificity. Ten patients with PD at early stage (Hohn & Yahr stage I and II) and 11 age-matched healthy control participants were recruited for measurement of serum p-Ser129-α-syn. RESULTS: AUC of the p-Ser129-α-syn in diluted human serum was 0.92 and it shows that p-Ser129-α-syn in diluted human serum could be used as a biomarker for the diagnosis of PD in clinics. CONCLUSIONS: P-Ser129-α-syn has low abundance in human serum, high detection sensitivity and specificity are critical to the success of the diagnosis of PD in clinics. In this study, a modified PSPWB was developed that the LOD at 1 ng/mL for p-Ser129-α-syn (standard) spiked into diluted human serum of a healthy control was performed. This result shows that the modified PSPWB can be used as a platform for detecting p-Ser129-α-syn in diluted human serum as a potential biomarker for PD.

8.
Zhonghua Xin Xue Guan Bing Za Zhi ; 48(11): 968-974, 2020 Nov 24.
Artigo em Chinês | MEDLINE | ID: mdl-33210870

RESUMO

Objective: To evaluate the incidence of cardiovascular disease (CVD), ischemic and hemorrhagic cardiovascular events among Chinese diabetic patients aged 40 years and above with different CVD risk levels. Methods: This study enrolled participants aged 40 years and above in 15 provinces from a prospective cohort study, the China-PAR project (Prediction for Atherosclerotic Cardiovascular Disease Risk in China). Participants were categorized into two groups according to the presence or absence of diabetes at baseline. Individuals were further classified into low (0-4.9%), moderate (5%-9.9%) and high risk groups (≥10%), based on predicted ten-year CVD risk using the China-PAR equations. Two followed-up surveys were conducted between 2007 and 2015 to identify CVD events, which were defined as nonfatal acute myocardial infarction, or death due to coronary heart disease, or stroke. Ischemic cardiovascular events included nonfatal acute myocardial infarction, or death due to coronary heart disease, or ischemic stroke. Hemorrhagic cardiovascular events included subarachnoid hemorrhage and intracerebral hemorrhage. The incidences of CVD, ischemic and hemorrhagic cardiovascular events were compared in diabetes and non-diabetes population with different CVD risk levels. Results: This study included 89 209 participants aged 40 years and above, the average follow-up period was 8.5 years. The age was (54.8±9.4) years, and 36 794 (41.2%) were men, and 5 730 (6.4%) were diabetic patients. In diabetes patients aged 40 years and above, 53.7% (3 075/5 730) were at high risk of CVD. Age-and sex-adjusted incidence of CVD, ischemic and hemorrhagic cardiovascular events (1 066.93/100 000 person-years, 824.23/100 000 person-years, and 211.56/100 000 person-years) were significantly lower in diabetes patients than those in non-diabetes population with high CVD risk (1 773.73/100 000 person-years, 1 228.18/100 000 person-years, and 446.49/100 000 person-years) (all P<0.001). Among high CVD risk populations, incidence of ischemic events was significantly higher in diabetic patients than in non-diabetes population (1 638.47/100 000 person-years vs. 1 228.18/100 000 person-years, P<0.001), but incidence of hemorrhagic events tended to be lower in diabetic patients than in non-diabetes population (415.70/100 000 person-years vs. 446.49/100 000 person-years, P=0.635). Incidence of ischemic and hemorrhagic events were similar between diabetes patients and non-diabetes population at low or moderate CVD risk groups (all P>0.05). Conclusions: More than half of diabetes patients aged 40 years and above in China have high CVD risk. The incidence of CVD, ischemic and hemorrhagic cardiovascular events are different in diabetic patients with different CVD risk levels.


Assuntos
Doenças Cardiovasculares , Diabetes Mellitus , Adulto , Doenças Cardiovasculares/epidemiologia , China/epidemiologia , Diabetes Mellitus/epidemiologia , Humanos , Incidência , Masculino , Estudos Prospectivos , Fatores de Risco
10.
Phys Rev Lett ; 124(24): 241802, 2020 Jun 19.
Artigo em Inglês | MEDLINE | ID: mdl-32639796

RESUMO

We report the most precise measurements to date of the strong-phase parameters between D^{0} and D[over ¯]^{0} decays to K_{S,L}^{0}π^{+}π^{-} using a sample of 2.93 fb^{-1} of e^{+}e^{-} annihilation data collected at a center-of-mass energy of 3.773 GeV with the BESIII detector at the BEPCII collider. Our results provide the key inputs for a binned model-independent determination of the Cabibbo-Kobayashi-Maskawa angle γ/ϕ_{3} with B decays. Using our results, the decay model sensitivity to the γ/ϕ_{3} measurement is expected to be between 0.7° and 1.2°, approximately a factor of three smaller than that achievable with previous measurements, based on the studies of the simulated data. The improved precision of this work ensures that measurements of γ/ϕ_{3} will not be limited by knowledge of strong phases for the next decade. Furthermore, our results provide critical input for other flavor-physics investigations, including charm mixing, other measurements of CP violation, and the measurement of strong-phase parameters for other D-decay modes.

11.
Zhonghua Bing Li Xue Za Zhi ; 49(7): 759-760, 2020 Jul 08.
Artigo em Chinês | MEDLINE | ID: mdl-32610397
12.
J Surg Oncol ; 122(3): 388-398, 2020 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-32383206

RESUMO

BACKGROUND: Cytoreductive surgery (CRS) with or without hyperthermic intraperitoneal chemotherapy (HIPEC) is indicated for patients with peritoneal dissemination of appendiceal cancer. The role of neoadjuvant chemotherapy (NAC) before CRS-HIPEC remains controversial. METHODS: A retrospective review of adult patients who underwent CRS ± HIPEC for metastatic appendiceal cancer between 2000-2017 was performed. Patients who received NAC followed by surgery were compared with those who underwent surgery first (SF) with and without 1:1 propensity score matching (PSM). RESULTS: Among 803 patients with appendiceal cancer who underwent CRS ± HIPEC, 225 (28%) received NAC, and 578 (72%) underwent SF. After PSM (n = 186), median overall survival (OS) did not differ (NAC: 40 vs SF: 56 months; P = .210) but recurrence-free survival (RFS) was worse among patients who received NAC (14 vs 22 months; P = .007). NAC was independently associated with worse OS (hazards ratio [HR], 1.81; 95% confidence interval [CI], 1.03-3.18) and RFS (HR, 1.93; 95% CI, 1.25-2.99). CONCLUSION: In this multi-institutional retrospective analysis of patients with peritoneal dissemination from appendiceal cancer, the use of NAC before CRS-HIPEC was associated with worse OS and RFS even after PSM and multivariable regression. Immediate surgery should be considered for patients with disease amenable to complete cytoreduction.


Assuntos
Neoplasias do Apêndice/tratamento farmacológico , Neoplasias do Apêndice/cirurgia , Hipertermia Induzida/métodos , Idoso , Neoplasias do Apêndice/mortalidade , Neoplasias do Apêndice/patologia , Quimioterapia Adjuvante , Procedimentos Cirúrgicos de Citorredução/métodos , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Terapia Neoadjuvante , Invasividade Neoplásica , Neoplasias Peritoneais/tratamento farmacológico , Neoplasias Peritoneais/mortalidade , Neoplasias Peritoneais/secundário , Neoplasias Peritoneais/cirurgia , Pontuação de Propensão , Estudos Retrospectivos , Resultado do Tratamento , Estados Unidos/epidemiologia
13.
Opt Express ; 28(2): 1206-1215, 2020 Jan 20.
Artigo em Inglês | MEDLINE | ID: mdl-32121835

RESUMO

A color-temperature tunable white light-emitting diode (LED) based on a newly developed monolithic color-tunable LED structure was demonstrated. The color-tunable LED structure consists of three different sets of quantum wells separated by intermediate carrier blocking layers that can independently emit visible lights from 460 to 650 nm under different injection currents. To generate white light, the color-tunable LED is operated under pulsed conditions with each pulse consisting of multiple steps of different current amplitudes and widths emitting different colors. The combined spectrum of different colors is aimed to mimic that of the blackbody radiation light source. The pulse rate is designed to be higher than the human eye response rate, so the human eye will not discern the emission of successive colors but a singular emission of white light. Results of a two-step pulse design show this method is able to generate white light from 2700 K - 6500 K. Moreover, their color coordinates fall within the 4-step MacAdam ellipses about the Planckian locus while achieving the Color Rendering Index (CRI) in the 80-90 range. Finally, simulations show improvement of CRI into the 90-100 range is possible with further optimization to the color-tunable LED spectral emission and use of three-step pulses.

14.
J Gastrointest Surg ; 24(5): 1201-1214, 2020 05.
Artigo em Inglês | MEDLINE | ID: mdl-32128679

RESUMO

BACKGROUND: The prevalence of incidental pancreatic cystic neoplasms (PCNs) has increased dramatically with advancements in cross-sectional imaging. Diagnostic imaging is limited in differentiating between benign and malignant PCNs. The aim of this review is to provide an overview of biomarkers that can be used to distinguish PCNs. METHODS: A review of the literature on molecular diagnosis of cystic neoplasms of the pancreas was performed. RESULTS: Pancreatic cysts can be categorized into inflammatory and non-inflammatory lesions. Inflammatory cysts include pancreatic pseudocysts. Noninflammatory lesions include both mucinous and non-mucinous lesions. Mucinous lesions include intraductal papillary mucinous neoplasm (IPMN) and mucinous cystic neoplasm. Non-mucinous lesions include serous cystadenoma and solid-pseudopapillary tumor of the pancreas. Imaging, cyst aspiration, and histologic findings, as well as carcinoembryonic antigen and amylase are commonly used to distinguish between cyst types. However, molecular techniques to detect differences in genetic mutations, protein expression, glycoproteomics, and metabolomic profiling are important developments in distinguishing between cyst types. DISCUSSION: Nomograms incorporating common clinical, laboratory, and imaging findings have been developed in a better effort to predict malignant IPMN. The incorporation of top molecular biomarker candidates to nomograms may improve the predictive ability of current models to more accurately diagnose malignant PCNs.


Assuntos
Cistadenoma Seroso , Cisto Pancreático , Neoplasias Pancreáticas , Pseudocisto Pancreático , Cistadenoma Seroso/diagnóstico por imagem , Cistadenoma Seroso/genética , Humanos , Pâncreas , Cisto Pancreático/diagnóstico por imagem , Cisto Pancreático/genética , Neoplasias Pancreáticas/diagnóstico por imagem , Neoplasias Pancreáticas/genética
15.
Phys Rev Lett ; 124(3): 032002, 2020 Jan 24.
Artigo em Inglês | MEDLINE | ID: mdl-32031834

RESUMO

Using a total of 11.0 fb^{-1} of e^{+}e^{-} collision data with center-of-mass energies between 4.009 and 4.6 GeV and collected with the BESIII detector at BEPCII, we measure fifteen exclusive cross sections and effective form factors for the process e^{+}e^{-}→Ξ^{-}Ξ[over ¯]^{+} by means of a single baryon-tag method. After performing a fit to the dressed cross section of e^{+}e^{-}→Ξ^{-}Ξ[over ¯]^{+}, no significant ψ(4230) or ψ(4260) resonance is observed in the Ξ^{-}Ξ[over ¯]^{+} final states, and upper limits at the 90% confidence level on Γ_{ee}B for the processes ψ(4230)/ψ(4260)→Ξ^{-}Ξ[over ¯]^{+} are determined. In addition, an excited Ξ baryon at 1820 MeV/c^{2} is observed with a statistical significance of 6.2-6.5σ by including the systematic uncertainty, and the mass and width are measured to be M=(1825.5±4.7±4.7) MeV/c^{2} and Γ=(17.0±15.0±7.9) MeV, which confirms the existence of the J^{P}=3/2^{-} state Ξ(1820).

16.
Zhonghua Yu Fang Yi Xue Za Zhi ; 54(1): 104-107, 2020 Jan 06.
Artigo em Chinês | MEDLINE | ID: mdl-31914577

RESUMO

From 1987 to 2017, cardiovascular disease (CVD) had been ranking the first cause of death in Suzhou, and the mortality rate showed an upward trend annual percentage changes (APC=0.62%, P=0.001), while the standardized mortality rate showed a downward trend (APC=-2.65%, P<0.001). The probability of premature death of CVD declined consistently from 7.06% in 1987 to 2.00% in 2017 (APC=-4.45%, P<0.001). When the life expectancy was set at 70, the potential years of life lost rate (PYLLR) decreased from 6.35‰ in 1987 to 3.30‰ in 2017, and the standardized PYLLR decreased from 7.30‰ to 2.68‰. When the life expectancy was set at 75, the PYLLR decreased from 10.12‰ to 5.19‰, and the standardized PYLLR decreased from 11.44‰ to 3.88‰. With the increase of years, all PYLLR and standardized PYLLR showed a significantly downward trend (APC=-2.51%--3.89%, P<0.001).


Assuntos
Doenças Cardiovasculares/mortalidade , Expectativa de Vida/tendências , Mortalidade Prematura/tendências , China/epidemiologia , Humanos , Probabilidade
17.
Phys Rev Lett ; 125(26): 262301, 2020 Dec 31.
Artigo em Inglês | MEDLINE | ID: mdl-33449792

RESUMO

Flow coefficients v_{n} of the orders n=1-6 are measured with the High-Acceptance DiElectron Spectrometer (HADES) at GSI for protons, deuterons, and tritons as a function of centrality, transverse momentum, and rapidity in Au+Au collisions at sqrt[s_{NN}]=2.4 GeV. Combining the information from the flow coefficients of all orders allows us to construct for the first time, at collision energies of a few GeV, a multidifferential picture of the angular emission pattern of these particles. It reflects the complicated interplay between the effect of the central fireball pressure on the emission of particles and their subsequent interaction with spectator matter. The high precision information on higher order flow coefficients is a major step forward in constraining the equation of state of dense baryonic matter.

18.
Phys Rev Lett ; 123(21): 211802, 2019 Nov 22.
Artigo em Inglês | MEDLINE | ID: mdl-31809130

RESUMO

We report the first observation of D^{+}→τ^{+}ν_{τ} with a significance of 5.1σ. We measure B(D^{+}→τ^{+}ν_{τ})=(1.20±0.24_{stat}±0.12_{syst})×10^{-3}. Taking the world average B(D^{+}→µ^{+}ν_{µ})=(3.74±0.17)×10^{-4}, we obtain R_{τ/µ}=Γ(D^{+}→τ^{+}ν_{τ})/Γ(D^{+}→µ^{+}ν_{µ})=3.21±0.64_{stat}±0.43_{syst}., which is consistent with the standard model expectation of lepton flavor universality. Using external inputs, our results give values for the D^{+} decay constant f_{D^{+}} and the Cabibbo-Kobayashi-Maskawa matrix element |V_{cd}| that are consistent with, but less precise than, other determinations.

19.
Phys Rev Lett ; 123(23): 231801, 2019 Dec 06.
Artigo em Inglês | MEDLINE | ID: mdl-31868427

RESUMO

By analyzing a 2.93 fb^{-1} data sample of e^{+}e^{-} collisions, recorded at a center-of-mass energy of 3.773 GeV with the BESIII detector operated at the BEPCII collider, we report the first observation of the semileptonic D^{+} transition into the axial-vector meson D^{+}→K[over ¯]_{1}(1270)^{0}e^{+}ν_{e} with a statistical significance greater than 10σ. Its decay branching fraction is determined to be B[D^{+}→K[over ¯]_{1}(1270)^{0}e^{+}ν_{e}]=(2.30±0.26_{-0.21}^{+0.18}±0.25)×10^{-3}, where the first and second uncertainties are statistical and systematic, respectively, and the third originates from the input branching fraction of K[over ¯]_{1}(1270)^{0}→K^{-}π^{+}π^{0}.

20.
Phys Rev Lett ; 123(23): 233602, 2019 Dec 06.
Artigo em Inglês | MEDLINE | ID: mdl-31868475

RESUMO

Virtual photons can mediate interaction between atoms, resulting in an energy shift known as a collective Lamb shift. Observing the collective Lamb shift is challenging, since it can be obscured by radiative decay and direct atom-atom interactions. Here, we place two superconducting qubits in a transmission line terminated by a mirror, which suppresses decay. We measure a collective Lamb shift reaching 0.8% of the qubit transition frequency and twice the transition linewidth. We also show that the qubits can interact via the transmission line even if one of them does not decay into it.

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