Bell inequality test with entanglement between an atom and a coherent state in a cavity

Abstract

We study Bell inequality tests with entanglement between a coherent-state field in a cavity and a two-level atom. In order to detect the cavity field for such a test, photon on/off measurements and photon number parity measurements, respectively, are investigated. When photon on/off measurements are used, at least 50% of detec- tion efficiency is required to demonstrate violation of the Bell inequality. Photon number parity measurements for the cavity field can be effectively performed using ancillary atoms and an atomic detector, which leads to large degrees of Bell violations up to Cirel'son's bound. We also analyze decoherence effects in both field and atomic modes and discuss conditions required to perform a Bell inequality test free from the locality loophole.

13 pages, 9 figures

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• Violation of Bell-CHSH inequality using imperfect photodetectors with optical hybrid states
• Steady Fock states via atomic reservoir
• Nonlinearity-Induced Entanglement Stability in a Qubit-Oscillator System
• Bell inequality tests using asymmetric entangled coherent states in asymmetric lossy environments
• Steady entanglements in bosonic dissipative networks
• Quasi-Bell states in a strongly coupled qubit-oscillator system and their delocalization in the phase space
• Certifying The Quantumness of A Generalized Coherent Control Scenario
• Evolution of a hybrid micro-macro entangled state of the qubit-oscillator system via the generalized rotating wave approximation
• Transmission losses in optical qubits for controlled teleportation
• Violating Bell's inequality with an artificial atom and a cat state in a cavity