Selective quantum evolution of a qubit state due to continuous measurement

By A. Korotkov. 2000

195 citations recorded by the source corpus.

We consider a two-level quantum system (qubit) that is continuously measured by a detector. The information provided by the detector is taken into account to describe the evolution during a particular realization of the measurement process. We discuss the Bayesian formalism for such ``selective'' evolution of an individual qubit and apply it to several solid-state setups. In particular, we show how to suppress qubit decoherence using continuous measurement and a feedback loop.

Subfields: Artificial Intelligence, Atomic and Molecular Physics, and Optics

View Paper: https://www.semanticscholar.org/paper/43f7ee203dc0e7da8e7d18ecea249d14e0ec2c0d

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In Artificial Intelligence

In Atomic and Molecular Physics, and Optics

Citations in the corpus

Quantum control theory and applications: A survey (2009, unknown): “urement theory for quantum feedback control. Fortunately, recent results have shown that continuous measurements are experimentally realizable for practical quantum systems such as solid-state qubits [90]. In continuous measurements, one can continuously monitor an observable of a quantum system and”
Introduction to quantum noise, measurement, and amplification (2008, methodology): “The topic of quantum-limited detection is also directly relevant to recent activity exploring feedback control of quantum systems (Doherty et al., 2000; Korotkov, 2001b; Ruskov and Korotkov, 2002; Wiseman and Milburn, 1993, 1994); such schemes necessarily need a close-to-quantum-limited detector.”