Real-time feedback control of a mesoscopic superposition

Abstract

We show that continuous real-time feedback can be used to track, control, and protect a mesoscopic superposition of two spatially separated wave-packets. The feedback protocol is enabled by an approximate state-estimator, and requires two continuous measurements, performed simultaneously. For nanomechanical and superconducting resonators, both measurements can be implemented by coupling the resonators to superconducting qubits.

4 pages, revtex4, 1 png figure

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Cited by in corpus (4)

• Quantum feedback: theory, experiments, and applications
• Spin cat states in a ferromagnetic insulator
• Selective linear or quadratic optomechanical coupling via measurement
• Reservoir engineering of a mechanical resonator: generating a macroscopic superposition state and monitoring its decoherence