Nonreciprocal Frequency Domain Beam Splitter.
Phys Rev Lett
; 127(25): 253603, 2021 Dec 17.
Article
em En
| MEDLINE
| ID: mdl-35029420
ABSTRACT
The canonical beam splitter-a fundamental building block of quantum optical systems-is a reciprocal element. It operates on forward- and backward-propagating modes in the same way, regardless of direction. The concept of nonreciprocal quantum photonic operations, by contrast, could be used to transform quantum states in a momentum- and direction-selective fashion. Here we demonstrate the basis for such a nonreciprocal transformation in the frequency domain through intermodal Bragg scattering four-wave mixing (BSFWM). Since the total number of idler and signal photons is conserved, the process can preserve coherence of quantum optical states, functioning as a nonreciprocal frequency beam splitter. We explore the origin of this nonreciprocity and find that the phase-matching requirements of intermodal BSFWM produce an enormous asymmetry (76×) in the conversion bandwidths for forward and backward configurations, yielding â¼25 dB of nonreciprocal contrast over several hundred GHz. We also outline how the demonstrated efficiencies (â¼10^{-4}) may be scaled to near-unity values with readily accessible powers and pumping configurations for applications in integrated quantum photonics.
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Ano de publicação:
2021
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Article