Phys. Rev. B 66, 041401(R) (2002) [4 pages]

Quantum feedback control of a solid-state qubit

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Rusko Ruskov^* and Alexander N. Korotkov
Department of Electrical Engineering, University of California, Riverside, California 92521-0204

Received 24 January 2002; published 28 June 2002

We have studied theoretically the basic operation of a quantum feedback loop designed to maintain a desired phase of quantum coherent oscillations in a single solid-state qubit. The degree of oscillations synchronization with external harmonic signal is calculated as a function of feedback strength, taking into account available bandwidth and coupling to environment. The feedback can efficiently suppress the dephasing of oscillations if the qubit coupling to the detector is stronger than the coupling to the environment.

URL:

http://link.aps.org/doi/10.1103/PhysRevB.66.041401

DOI:

10.1103/PhysRevB.66.041401

PACS:

73.23.-b, 03.65.Yz, 03.67.Lx

^*On leave from INRNE, Sofia BG-1784, Bulgaria.

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Phys. Rev. B 66, 041401(R) (2002) [4 pages]

Quantum feedback control of a solid-state qubit