Maintaining Quantum Coherence in the Presence of Noise through State Monitoring

Abstract

Unsharp POVM measurements allow the estimation and tracking of quantum wavefunctions in real-time with minimal disruption of the dynamics. Here we demonstrate that high fidelity state monitoring, and hence quantum control, is possible even in the presence of classical dephasing and amplitude noise, by simulating such measurements on a two-level system undergoing Rabi oscillations. Finite estimation fidelity is found to persist indefinitely long after the decoherence times set by the noise fields in the absence of measurement.

5 pages, 4 figures

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Cited by in corpus (10)

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• Unsharp continuous measurement of a Bose-Einstein condensate: full quantum state estimation and the transition to classicality
• Limits of optimal control yields achievable with quantum controllers
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• Equation of Motion for Estimation Fidelity of Monitored Oscillating Qubits
• Limiting distribution of periodic position measurements of a quantum harmonic oscillator