Maintaining coherent oscillations in a solid-state qubit via continuous quantum feedback control

Rusko Ruskov; Qin Zhang; Alexander N. Korotkov

doi:10.1117/12.542780

24 August 2004 Maintaining coherent oscillations in a solid-state qubit via continuous quantum feedback control

Rusko Ruskov, Qin Zhang, Alexander N. Korotkov

Proceedings Volume 5436, Quantum Information and Computation II; (2004) https://doi.org/10.1117/12.542780
Event: Defense and Security, 2004, Orlando, Florida, United States

Abstract

We discuss the operation of the one-qubit quantum feedback loop, which may be used for initialization of a qubit in a solid-state quantum computer. The continuous monitoring of a quantum state, which makes the feedback possible, is done by means of a weak continuous measurement and processing of the obtained information via quantum Bayesian equations. The properly designed quantum feedback loop can keep the desired phase of a single-qubit quantum coherent oscillations for infinitely long time, even in presence of a dephasing environment. Various nonidealities reduce the fidelity of the feedback synchronization. We report our study of the effects of finite available bandwidth and time delay on the one-qubit quantum feedback performance, and also discuss the effect of environment-induced dephasing.

Citation Download Citation

Rusko Ruskov, Qin Zhang, and Alexander N. Korotkov "Maintaining coherent oscillations in a solid-state qubit via continuous quantum feedback control", Proc. SPIE 5436, Quantum Information and Computation II, (24 August 2004); https://doi.org/10.1117/12.542780

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