Semiclassical model for a memory dephasing channel

Abstract

We study a dephasing channel with memory, described by a Hamiltonian model in which the system-environment interaction is described by a stochastic process. We propose a useful way to describe the channel uses correlations. Moreover, we give a general expression for the coherences decay factors as a function of the number of channel uses and of the stochastic process power spectrum. We also study the impact of memory on the three qubit code, showing that correlations among channel uses affect very little the code performance.

8pages, 3 figures, proceedings of CEWQO 2008 Conference

References in corpus (6)

• Experimental demonstration of entanglement-enhanced classical communication over a quantum channel with correlated noise
• Quantum Capacity of a dephasing channel with memory
• Spin chains and channels with memory
• Coding Theorem for a Class of Quantum Channels with Long-Term Memory
• Decoherence by Correlated Noise and Quantum Error Correction
• Correlated errors can lead to better performance of quantum codes