Combes J, Jacobs K. Rapid state reduction of quantum systems using feedback control.
PHYSICAL REVIEW LETTERS 2006;
96:010504. [PMID:
16486431 DOI:
10.1103/physrevlett.96.010504]
[Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/17/2005] [Indexed: 05/06/2023]
Abstract
We consider using Hamiltonian feedback control to increase the speed at which a continuous measurement purifies (reduces) the state of a quantum system, and thus to increase the speed of the preparation of pure states. For a measurement of an observable with equispaced eigenvalues, we show that there exists a feedback algorithm which will speed up the rate of state reduction by at least a factor of 2(N + 1)/3.
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