Quantum filtering one bit at a time
arXiv:1108.0823 · doi:10.1103/PhysRevLett.107.260503
Abstract
In this paper we consider the purification of a quantum state using the information obtained from a continuous measurement record, where the classical measurement record is digitized to a single bit per measurement after the measurements have been made. Analysis indicates that efficient and reliable state purification is achievable for one- and two-qubit systems. We also consider quantum feedback control based on the discrete one-bit measurement sequences.
5 pages, 3 figures
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- Reverse quantum state engineering using electronic feedback loops
- Confidence and Backaction in the Quantum Filter Equation
- Feedback Control of Waiting Times
- Noise-Canceling Quantum Feedback: non-Hermitian Dynamics with Applications to State Preparation and Magic State Distillation