Quantum Back-Action of an Individual Variable-Strength Measurement

被引：221

作者：

Hatridge, M. ^{[1
]}

Shankar, S. ^{[1
]}

Mirrahimi, M. ^{[1
,2
]}

Schackert, F. ^{[1
]}

Geerlings, K. ^{[1
]}

Brecht, T. ^{[1
]}

Sliwa, K. M. ^{[1
]}

Abdo, B. ^{[1
]}

Frunzio, L. ^{[1
]}

Girvin, S. M. ^{[1
]}

Schoelkopf, R. J. ^{[1
]}

Devoret, M. H. ^{[1
]}

机构：

[1] Yale Univ, Dept Phys & Appl Phys, New Haven, CT 06520 USA

[2] Inst Natl Rech Informat & Automat Paris Rocquenco, F-78153 Le Chesnay, France

来源：

SCIENCE | 2013年 / 339卷 / 6116期

基金：

美国国家科学基金会;

关键词：

JOSEPHSON RING MODULATOR; SUPERCONDUCTING QUBIT; PHOTON; ELECTRODYNAMICS; COLLAPSE; LIMIT;

D O I：

10.1126/science.1226897

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Measuring a quantum system can randomly perturb its state. The strength and nature of this back-action depend on the quantity that is measured. In a partial measurement performed by an ideal apparatus, quantum physics predicts that the system remains in a pure state whose evolution can be tracked perfectly from the measurement record. We demonstrated this property using a superconducting qubit dispersively coupled to a cavity traversed by a microwave signal. The back-action on the qubit state of a single measurement of both signal quadratures was observed and shown to produce a stochastic operation whose action is determined by the measurement result. This accurate monitoring of a qubit state is an essential prerequisite for measurement-based feedback control of quantum systems.

引用

页码：178 / 181

页数：4

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