Bell-inequality violation by dynamical Casimir photons in a superconducting microwave circuit
Riddhi Chatterjee, A. S. Majumdar
DOI 10.1103/PhysRevA.106.042224 · Physical Review A
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Abstract
We study the Bell's inequality violation by dynamical Casimir radiation with pseudospin measurement. We consider a circuit quantum electrodynamical setup where a relativistically moving mirror is simulated by variable external magnetic flux in a superconducting quantum interference device terminating a superconducting-microwave waveguide. We analytically obtain expectation values of the Bell operator optimized with respect to channel orientations in terms of the system parameters. We consider the effects of local noise in the microwave field modes, asymmetry between the field modes resulting from nonzero detuning, and signal loss. Our analysis provides ranges of the above experimental parameters for which the Bell violation can be observed. We show that the Bell violation can be observed in this setup up to 40mK temperature as well as up to 65% signal loss.
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