Using Spontaneous Emission of a Qubit as a Resource for Feedback Control

Abstract

Persistent control of a transmon qubit is performed by a feedback protocol based on continuous heterodyne measurement of its fluorescence. By driving the qubit and cavity with microwave signals whose amplitudes depend linearly on the instantaneous values of the quadratures of the measured fluorescence field, we show that it is possible to stabilize permanently the qubit in any targeted state. Using a Josephson mixer as a phase-preserving amplifier, it was possible to reach a total measurement efficiency $\eta$=35%, leading to a maximum of 59% of excitation and 44% of coherence for the stabilized states. The experiment demonstrates multiple-input multiple-output analog Markovian feedback in the quantum regime.

Supplementary material can be found as an ancillary object

References in corpus (13)

• Quantum information processing with circuit quantum electrodynamics
• Confining the state of light to a quantum manifold by engineered two-photon loss
• Quantum feedback control of a superconducting qubit: Persistent Rabi oscillations
• Generating Single Microwave Photons in a Circuit
• Qubit-photon interactions in a cavity: Measurement induced dephasing and number splitting
• Black-box superconducting circuit quantization
• Quantum trajectory approach to circuit QED: Quantum jumps and the Zeno effect
• Quantum back-action of variable-strength measurement
• Feedback control of a solid-state qubit using high-fidelity projective measurement
• Widely tunable, non-degenerate three-wave mixing microwave device operating near the quantum limit
• Observing quantum state diffusion by heterodyne detection of fluorescence
• Efficient Quantum Filtering for Quantum Feedback Control
• Mapping quantum state dynamics in spontaneous emission

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