Quantum functionalities via feedback amplification
arXiv:1909.12822 · doi:10.1103/PhysRevApplied.15.044006
Abstract
Feedback amplification is a key technique for synthesizing various important functionalities, especially in electronic circuits involving op-amps. This paper presents a quantum version of this methodology, where the general phase-preserving quantum amplifier and coherent (i.e., measurement-free) feedback are employed to construct various type of systems having useful functionalities: quantum versions of differentiator, integrator, self-oscillator, and active filters. The class of active filters includes the Butterworth filter, which can be used to enhance the capacity of an optical quantum communication channel, and the non-reciprocal amplifier, which enables measurement of a superconducting qubits system as well as protection of it by separating input from output fields. A particularly detailed investigation is performed on the active phase-cancelling filter for realizing a broadband gravitational-wave detector; that is, the feedback amplification method is used to construct an active filter that compensates the phase delay of the signal and eventually recovers the sensitivity in the high frequency regime.
23 pages, 18 figures, almost the same as the journal version
References in corpus (15)
- Nonreciprocal Photon Transmission and Amplification via Reservoir Engineering
- Feedback cooling of a cantilever's fundamental mode below 5 mK
- Coherent-feedback quantum control with a dynamic compensator
- Quantum correlations between the light and kilogram-mass mirrors of LIGO
- Quantum limits on phase-preserving linear amplifiers
- Quantum dynamics of a few-photon parametric oscillator
- Coherent versus measurement feedback: Linear systems theory for quantum information
- Coherent Cancellation of Backaction Noise in optomechanical Force Measurements
- Conditional Ramsey Spectroscopy with Synchronized Atoms
- Semiclassical Phase Reduction Theory for Quantum Synchronization
- A superconducting microwave multivibrator produced by coherent feedback
- Gain, directionality and noise in microwave SQUID amplifiers: Input-output approach
- Converting the signal-recycling cavity into an unstable optomechanical filter to enhance the detection bandwidth of gravitational-wave detectors
- Quantum proportional-integral (PI) control
- Isolated Loops in Quantum Feedback Networks