Advantages of Coherent Feedback for Cooling Quantum Oscillators

Hamerly, Ryan; Mabuchi, Hideo

doi:10.1103/physrevlett.109.173602

Cited by 128 publications

(178 citation statements)

References 39 publications

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“…Coherent feedback is a superset of measurement-based feedback [59], and it has been shown that coherent feedback can achieve better performance than measurement-based feedback in a number of settings, including noise reduction and cooling in linear systems [60,61], as well as noise reduction under bounded controls [59]. It has also been applied to generating nonlinear effects in mesoscopic systems [13,62].…”

Section: Example: Non-markovian Coherent Feedback Networkmentioning

confidence: 99%

Non-Markovian quantum input-output networks

Zhang

Liu

et al. 2013

Phys. Rev. A

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Quantum input-output response analysis is a useful method for modeling the dynamics of complex quantum networks, such as those for communication or quantum control via cascade connections. Non-Markovian effects are expected to be important in networks realized using mesoscopic circuits, but such effects have not yet been studied. Here we extend the Markovian input-output network formalism to non-Markovian networks. The general formalism can be applied to various examples: (i) we show how non-Markovian coherent feedback can reduce the speed of decoherence for an atom in an optical cavity; (ii) we examine the effect of finite-cavity bandwidths in a superconducting circuit.

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Section: Example: Non-markovian Coherent Feedback Networkmentioning

confidence: 99%

Non-Markovian quantum input-output networks

Zhang

Liu

et al. 2013

Phys. Rev. A

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“…The sideband fields are coherently fed back to the main interferometer. In some sense, this is one example of coherent feedback that has been extensively discussed in the quantum optics and control communities [8][9][10][11]. Depending on the choices of optical filters, different interferometer responses and sensitivities can be obtained.…”

Section: Introductionmentioning

confidence: 99%

Sensitivity of intracavity filtering schemes for detecting gravitational waves

et al. 2014

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We consider enhancing the sensitivity of future gravitational-wave detectors by adding optical filters inside the signal-recycling cavity-an intracavity filtering scheme, which coherently feeds the sideband signal back to the interferometer with a proper frequency-dependent phase. We study three cases of such a scheme with different motivations: (i) the case of backaction noise evasion, trying to cancel radiationpressure noise with only one filter cavity for a signal-recycled interferometer; (ii) the speed-meter case, similar to the speed-meter scheme proposed by Purdue and Chen [Phys. Rev. D 66, 122004 (2002)] but without the resonant-sideband-extraction mirror, and also relieves the optical requirement on the sloshing mirror; (iii) the broadband detection case with squeezed-light input, numerically optimized for a broadband sensitivity.

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“…We do not characterize performance in the quantum regime, but these devices feature regularly in such work and these capabilities are novel regardless. Moreover, because the network is linear and driven by Gaussian fields, the network characterization done in the classical regime should apply in the quantum one [1,[22][23][24][25][26][27]. Thus, we use the term ''coherent'' in the sense that an interferometer or resonator is coherent, which is the primary prerequisite for quantum dynamics.…”

Section: Introductionmentioning

confidence: 99%

“…(Rigorous derivations are well covered in the literature, e.g., Refs. [1,[22][23][24][25]30,31].) Also, because it employs theoretical approaches developed by an electrical engineering community, familiar concepts in electromechanics are described in more detail than usual.…”

Section: Introductionmentioning

confidence: 99%

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Tunable Coupling to a Mechanical Oscillator Circuit Using a Coherent Feedback Network

Kerckhoff

Andrews

et al. 2013

Phys. Rev. X

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We demonstrate a fully cryogenic microwave feedback network composed of modular superconducting devices connected by transmission lines and designed to control a mechanical oscillator that is coupled to one of the devices. The network features an electromechanical device and a tunable controller that coherently receives, processes, and feeds back continuous microwave signals that modify the dynamics and readout of the mechanical state. While previous electromechanical systems represent some compromise between efficient control and efficient readout of the mechanical state, as set by the electromagnetic decay rate, the tunable controller produces a closed-loop network that can be dynamically and continuously tuned between both extremes much faster than the mechanical response time. We demonstrate that the microwave decay rate may be modulated by at least a factor of 10 at a rate greater than 10 4 times the mechanical response rate. The system is easy to build and suggests that some useful functions may arise most naturally at the network level of modular, quantum electromagnetic devices.

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Advantages of Coherent Feedback for Cooling Quantum Oscillators

Cited by 128 publications

References 39 publications

Non-Markovian quantum input-output networks

Non-Markovian quantum input-output networks

Sensitivity of intracavity filtering schemes for detecting gravitational waves

Tunable Coupling to a Mechanical Oscillator Circuit Using a Coherent Feedback Network

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