Accession Number:

ADP013141

Title:

Continuous Quantum Measurement of a Qubit State

Descriptive Note:

Conference proceedings

Corporate Author:

STATE UNIV OF NEW YORK AT STONY BROOK DEPT OF PHYSICS AND ASTRONOMY

Personal Author(s):

Report Date:

2000-06-23

Pagination or Media Count:

4.0

Abstract:

We consider a two-level quantum system qubit which is continuously measured by a detector. The conventional formalism, which implies the ensemble averaging, describes the gradual decoherence of the qubit state due to measurement. However, in each particular realization of the measurement process we can have the opposite effect gradual purification of the qubit density matrix. This can be described by the recently developed Bayesian formalism suitable for individual quantum systems. The purification effect may be verified experimentally using present day technology and can be useful for quantum computing. In particular, the decoherence of a single qubit can be suppressed using continuous measurement and the feedback loop.

Subject Categories:

  • Solid State Physics
  • Electricity and Magnetism
  • Electrical and Electronic Equipment

Distribution Statement:

APPROVED FOR PUBLIC RELEASE