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Quantum Machines: Measurement and Control of Engineered Quantum SystemsLecture Notes of the Les Houches Summer School: Volume 96, July 2011$
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Michel Devoret, Benjamin Huard, Robert Schoelkopf, and Leticia F. Cugliandolo

Print publication date: 2014

Print ISBN-13: 9780199681181

Published to Oxford Scholarship Online: September 2014

DOI: 10.1093/acprof:oso/9780199681181.001.0001

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Quantum Bayesian approach to circuit QED measurement

Quantum Bayesian approach to circuit QED measurement

Chapter:
(p.533) 17 Quantum Bayesian approach to circuit QED measurement
Source:
Quantum Machines: Measurement and Control of Engineered Quantum Systems
Author(s):

A. N. Korotkov

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780199681181.003.0017

This chapter introduces a puzzling property of the monitoring of a qubit by a coherent signal traversing a cavity dispersively coupled to the qubit. If the measurement of the signal is done by a fully efficient phase-sensitive amplifier, no noise is added by the amplifier and the backaction of the amplifier on the qubit induces the Bloch vector of the latter to diffuse along a line of longitude. When the measurement of the signal is done by a fully efficient phase-preserving amplifier, extra noise of quantum origin is added by the amplifier owing to the presence of the idler port, but the state of the qubit remains pure, the backaction-induced diffusion of the Bloch vector now occurring on the entire Bloch sphere.

Keywords:   quantum matter-light interaction, one dimension, artificial atom

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