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Quantum Electronics and Laser Science Conference

Using quantum feedback to preserve the vacuum Rabi oscillations in cavity QED

Joseph E. Reiner, Wade P. Smith, J. Wang, Howard M. Wiseman, Luis A. Orozco

Published Nov 13, 2002• 3 citations
Publisher

Abstract

Summary form only given. Quantum feedback has been proposed as a way to fight against both dissipation and decoherence in a quantum system. The method for implementing quantum feedback depends upon both the system and the purpose of the feedback. Some feedback schemes try to stabilize a system by forcing it into a particular quantum state. Other schemes wish to protect the system's evolution from environmental effects. This talk will focus on the latter.

DOI
10.1109/qels.2001.961844

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Summary form only given. Quantum feedback has been proposed as a way to fight against both dissipation and decoherence in a quantum system. The method for implementing quantum feedback depends upon both the system and the purpose of the feedback. Some feedback schemes try to stabilize a system by forcing it into a particular quantum state. Other schemes wish to protect the system's evolution from environmental effects. This talk will focus on the latter.
Quantum feedback in strongly coupled systems can probe a regime where one quantum of excitation is a large fluctuation. We present theoretical and experimental studies of quantum feedback in an optical cavity QED system. The time evolution of the conditional state, following a photodetection, can be modified by changing the drive of the cavity. For the appropriate feedback, the conditional state can be captured in a new steady state and then released. The feedback protocol requires resonance operation, and proper amplitude and delay for the change in the drive. We demonstrate the successful use of feedback in the suppression of the vacuum Rabi oscillations for the length of the feedback pulse and their subsequent return to steady state. The feedback works only because we have an entangled quantum system, rather than an analogous correlated classical system.
We implement a permanent quantum feedback procedure. It prepares on-demand and stabilizes photon-number states in a high-quality superconducting microwave cavity. The feedback uses sensitive circular atoms to probe the cavity field in a Quantum Non Demolition way. This information is used by a controller and an actuator to feed small coherent amplitudes into the cavity, leading it deterministically towards the target state with a high fidelity. Quantum jumps of the photon number are detected and their effect is then actively compensated, protecting this fragile quantum resource against decoherence.