@article{80ca80096d4d4ed490e9d52c1fd6509a,
title = "Qubit Measurement by Multichannel Driving",
abstract = "We theoretically propose and experimentally implement a method of measuring a qubit by driving it close to the frequency of a dispersively coupled bosonic mode. The separation of the bosonic states corresponding to different qubit states begins essentially immediately at maximum rate, leading to a speedup in the measurement protocol. Also the bosonic mode can be simultaneously driven to optimize measurement speed and fidelity. We experimentally test this measurement protocol using a superconducting qubit coupled to a resonator mode. For a certain measurement time, we observe that the conventional dispersive readout yields close to 100% higher average measurement error than our protocol. Finally, we use an additional resonator drive to leave the resonator state to vacuum if the qubit is in the ground state during the measurement protocol. This suggests that the proposed measurement technique may become useful in unconditionally resetting the resonator to a vacuum state after the measurement pulse.",
keywords = "quantum computation, superconducting qubits, quantum measurements, quantum sensing, OtaNano",
author = "Joni Ikonen and Jan Goetz and Jesper Ilves and Aarne Ker{\"a}nen and Gunyho, {Andras M.} and Matti Partanen and Tan, {Kuan Y.} and Dibyendu Hazra and Leif Gr{\"o}nberg and Visa Vesterinen and Slawomir Simbierowicz and Juha Hassel and Mikko M{\"o}tt{\"o}nen",
note = "Funding Information: We acknowledge William Oliver, Greg Calusine, Kevin O'Brien, and Irfan Siddiqi for providing us with the traveling-wave parametric amplifier used in the experiments. This research was financially supported by European Research Council under Grant No.A681311 (QUESS) and Marie Sklodowska-Curie Grant No.A795159; by Academy of Finland under its Centres of Excellence Program Grants No.A312300 and NoA312059 and under other Grants No.A265675, No.A305237, No.A305306, No.A308161, No.A312300, No.A314302, No.316551, and No.A319579; Finnish Cultural Foundation, the Jane and Aatos Erkko Foundation, Vilho, Yrjo and Kalle Vaisala Foundation, and the Technology Industries of Finland Centennial Foundation. We thank the provision of facilities and technical support by Aalto University at OtaNano-Micronova Nanofabrication Centre Publisher Copyright: {\textcopyright} 2019 American Physical Society. Copyright: Copyright 2019 Elsevier B.V., All rights reserved.",
year = "2019",
month = feb,
day = "25",
doi = "10.1103/PhysRevLett.122.080503",
language = "English",
volume = "122",
journal = "Physical Review Letters",
issn = "0031-9007",
publisher = "American Physical Society (APS)",
number = "8",
}