Reducing decoherence in quantum computer memory with all quantum bits coupling to the same environment

Details Reducing decoherence in quantum computer memory with all quantum bits coupling to the same environment Reducing decoherence in quantum computer memory with all quantum bits coupling to the same environment

1996-11-29

arxiv.org/abs/quant-ph/9612003v2

Phys. Rev. A 57 (2), 737 (1998)

Physics

Quantum Physics

Corrections in references and introduction

Scientific paper

10.1103/PhysRevA.57.737

Decoherence in quantum computer memory due to the inevitable coupling to the external environment is examined. We take the assumption that all quantum bits (qubits) interact with the same environment rather than the assumption of separate environments for different qubits. It is found that the qubits are decohered collectively. For some kinds of entangled input states, no decoherence occurs at all in the memory even if the qubits are interacting with the environment. Based on this phenomenon, a scheme is proposed for reducing the collective decoherence. We also discuss possible implications of this decoherence model for quantum measurements.

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