Entanglement properties of optical coherent states under amplitude damping

Abstract

Through concurrence, we characterize the entanglement properties of optical coherent-state qubits subject to an amplitude damping channel. We investigate the distillation capabilities of known error correcting codes and obtain upper bounds on the entanglement depending on the non-orthogonality of the coherent states and the channel damping parameter. This work provides a first, full quantitative analysis of these photon-loss codes which are naturally reminiscent of the standard qubit codes against Pauli errors.

arXiv comment7 pages, 6 figures. Revised version with small corrections; main results remain unaltered

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• Quantum error correction against photon loss using multi-component cat states
• Building a large-scale quantum computer with continuous-variable optical technologies
• Approximate quantum error correction for generalized amplitude damping errors
• Quantum error-correction of continuous-variable states with realistic resources
• Exact dynamics for optical coherent-state qubits subject to environment noise
• Toward a quantum repeater protocol based on the coherent state approach
• Teleportation of squeezed states in the absence and presence of dissipation
• Quantum error correction and detection: quantitative analysis of a coherent-state amplitude damping code
• Optimal correction of independent and correlated errors
• Quantum discord in photon added Glauber coherent states of $\mathrm{GHZ}$-type