Unambiguous discrimination of nonorthogonal entangled quantum states in cavity QED

In this work we propose a scheme in the context of superconducting cavities to unambiguously discriminate non-orthogonal quantum field states when one of them is one of the four Bell states. The present work, which generalizes an earlier proposal [1] dealing with non-entangled states, also makes use...

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Bibliographic Details
Published in:Physics letters. A 2019-09, Vol.383 (25), p.3069-3073
Main Authors: de Assis, R.J., Sales, J.S., de Almeida, N.G.
Format: Article
Language:English
Subjects:
Bell states
Cavity QED
Generalized measurements
POVM
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Summary:In this work we propose a scheme in the context of superconducting cavities to unambiguously discriminate non-orthogonal quantum field states when one of them is one of the four Bell states. The present work, which generalizes an earlier proposal [1] dealing with non-entangled states, also makes use of a single high Q cavity, a sample of three-level atoms, Ramsey zones and selective detectors, thus consisting of an oversimplification from the experimental view. •No explicit POVM technique is used to unambiguously discriminate nonorthogonal Bell states into a bimodal high-Q cavity.•Our proposal circumvents the impossibility to directly project the cavity states onto the computational Fock states.•Our protocol without explicit POVM achieves a rate of success probability greater than the direct projective techniques.
ISSN:0375-9601
1873-2429
DOI:10.1016/j.physleta.2019.07.010