Continuous quantum feedback of coherent oscillations in a solid-state qubit
Qin Zhang, Rusko Ruskov, and Alexander N. Korotkov
TL;DR
This paper presents a theoretical analysis of Bayesian quantum feedback control in solid-state qubits, focusing on maintaining coherent oscillations despite environmental dephasing and detector imperfections.
Contribution
It introduces a comprehensive theoretical framework for quantum feedback control in solid-state qubits, including effects of dephasing, detector nonideality, and parameter deviations.
Findings
Feedback efficiency decreases with increased dephasing and detector nonideality.
Quantum feedback can stabilize coherent oscillations in asymmetric qubits.
Theoretical insights guide experimental implementations of quantum control.
Abstract
We have analyzed theoretically the operation of the Bayesian quantum feedback of a solid-state qubit, designed to maintain perfect coherent oscillations in the qubit for arbitrarily long time. In particular, we have studied the feedback efficiency in presence of dephasing environment and detector nonideality. Also, we have analyzed the effect of qubit parameter deviations and studied the quantum feedback control of an energy-asymmetric qubit.
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