Entanglement of coherent states and decoherence

Abstract

A possibility to produce entangled superpositions of strong coherent states is discussed. A recent proposal by Howell and Yazell [Phys. Rev. A 62, 012102 (2000)] of a device which entangles two strong coherent coherent states is critically examined. A serious flaw in their design is found. New modified scheme is proposed and it is shown that it really can generate non-classical states that can violate Bell inequality. Moreover, a profound analysis of the effect of losses and decoherence on the degree of entanglement is accomplished. It reveals the high sensitivity of the device to any disturbances and the fragility of generated states.

References in corpus (2)

• Quantum Cryptography with Coherent States
• Nonclassical Fields and the Nonlinear Interferometer

Cited by in corpus (9)

• Purification and detection of entangled coherent states
• Characterizations and Quantifications of Macroscopic Quantumness and Its Implementations using Optical Fields
• Efficient noiseless linear amplification for light fields with larger amplitudes
• Dispersion cancellation and non-classical noise reduction for large photon-number states
• Bell inequality tests using asymmetric entangled coherent states in asymmetric lossy environments
• Bell-inequality violation with "thermal" radiation
• Violation of Bell's inequalities with pre-amplified homodyne detection
• Entanglement distribution by an arbitrarily inept delivery service
• Entangled coherent states under dissipation