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Quantum Feedback and Traveling-wave ...

Macklin, Christopher Stewart.

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Quantum Feedback and Traveling-wave Parametric Amplification in Superconducting Circuits.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Quantum Feedback and Traveling-wave Parametric Amplification in Superconducting Circuits./
Author:	Macklin, Christopher Stewart.
Description:	151 p.
Notes:	Source: Dissertation Abstracts International, Volume: 77-01(E), Section: B.
Contained By:	Dissertation Abstracts International77-01B(E).
Subject:	Physics. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3720649
ISBN:	9781339017129

Quantum Feedback and Traveling-wave Parametric Amplification in Superconducting Circuits.
Macklin, Christopher Stewart.

Quantum Feedback and Traveling-wave Parametric Amplification in Superconducting Circuits. - 151 p.

Source: Dissertation Abstracts International, Volume: 77-01(E), Section: B.

Thesis (Ph.D.)--University of California, Berkeley, 2015.

Feedback control in classical systems is an indispensable, ubiquitous tool. The theoretical basis for achieving optimal classical control is well understood, and crucially relies on a very classical assumption: that measurements of the state of a system under control need not perturb that state. In a quantum context this assumption is fundamentally invalid. Although many aspects of the theory of quantum feedback control are relatively well developed, the technological basis for feedback control of a single quantum system has only very recently matured. We demonstrate the experimental realization of a quantum feedback control protocol, perpetually stabilizing the coherent Rabi oscillations of a superconducting qubit. This is the first utilization of quantum feedback control for stabilizing a dynamical process, and the first application of quantum feedback in a solid-state system of any kind. This demonstration comprises the first half of this thesis. The feedback protocol is predicated on the ability to make high-fidelity quantum measurements, which are enabled by quantum-limited Josephson parametric amplifiers (JPAs). The design and realization of the novel Josephson traveling-wave parametric amplifier (JTWPA) comprises the second half of this thesis. The JTWPA achieves order-of-magnitude improvements over state of the art JPAs in bandwidth and signal power handling while providing quantum-limited noise performance, potentially enabling the simultaneous readout of dozens of superconducting qubits and the generation of broadband multi-mode squeezing in the microwave domain.

ISBN: 9781339017129Subjects--Topical Terms:

516296
Physics.

Quantum Feedback and Traveling-wave Parametric Amplification in Superconducting Circuits.
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502 $a Thesis (Ph.D.)--University of California, Berkeley, 2015.
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