@article{63c150dc275144b98ad8a1226e749d82,
title = "Measurement of a superconducting qubit with a microwave photon counter",
abstract = "Fast, high-fidelity measurement is a key ingredient for quantum error correction. Conventional approaches to the measurement of superconducting qubits, involving linear amplification of a microwave probe tone followed by heterodyne detection at room temperature, do not scale well to large system sizes. We introduce an approach to measurement based on a microwave photon counter demonstrating raw single-shot measurement fidelity of 92%. Moreover, the intrinsic damping of the photon counter is used to extract the energy released by the measurement process, allowing repeated high-fidelity quantum nondemolition measurements. Our scheme provides access to the classical outcome of projective quantum measurement at the millikelvin stage and could form the basis for a scalable quantum-to-classical interface.",
author = "A. Opremcak and Pechenezhskiy, {I. V.} and C. Howington and Christensen, {B. G.} and Beck, {M. A.} and E. Leonard and J. Suttle and C. Wilen and Nesterov, {K. N.} and Ribeill, {G. J.} and T. Thorbeck and F. Schlenker and Vavilov, {M. G.} and Plourde, {B. L.T.} and R. McDermott",
note = "Funding Information: We acknowledge stimulating discussions with M. Vinje, L. B. Ioffe, and M. Saffman. Portions of this work were performed in the Wisconsin Center for Applied Microelectronics, a research core facility managed by the College of Engineering and supported by the University of Wisconsin–Madison. Other portions were performed at the Cornell NanoScale Facility, a member of the National Nanotechnology Coordinated Infrastructure (NNCI), which is supported by the National Science Foundation under grant no. ECCS-1542081. R.M., B.L.T.P., and M.G.V. are inventors on patent number US 9,692,423 B2 held by Wisconsin Alumni Research Foundation, Syracuse University, and Universit{\"a}t des Saarlandes that covers a system and method for circuit quantum electrodynamics measurement. This work was supported by the U.S. Government under ARO grants W911NF-14-1-0080 and W911NF-15-1-0248. Publisher Copyright: 2017 {\textcopyright} The Authors, some rights reserved.",
year = "2018",
month = sep,
day = "21",
doi = "10.1126/science.aat4625",
language = "English (US)",
volume = "361",
pages = "1239--1242",
journal = "Science",
issn = "0036-8075",
publisher = "American Association for the Advancement of Science",
number = "6408",
}