Resonant cooper-pair tunneling: quantum noise and measurement characteristics.
Phys Rev Lett
; 89(17): 176804, 2002 Oct 21.
Article
em En
| MEDLINE
| ID: mdl-12398696
ABSTRACT
We study the quantum charge noise and measurement properties of the double Cooper-pair resonance point in a superconducting single-electron transistor (SSET) coupled to a Josephson charge qubit. Using a density-matrix approach for the coupled system, we obtain a full description of the measurement backaction; for weak coupling, this is used to extract the quantum charge noise. Unlike the case of a nonsuperconducting SET, the backaction here can induce population inversion in the qubit. We find that the Cooper-pair resonance process allows for a much better measurement than a similar nonsuperconducting SET, and can approach the quantum limit of efficiency.
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01-internacional
Base de dados:
MEDLINE
Idioma:
En
Revista:
Phys Rev Lett
Ano de publicação:
2002
Tipo de documento:
Article
País de afiliação:
Estados Unidos