Broadband filters for abatement of spontaneous emission in circuit quantum electrodynamics

Journal Article · Mon Oct 26 00:00:00 EDT 2015 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4934867· OSTI ID:22485968

Hertzberg, Jared B.; Córcoles, Antonio D.; Gambetta, Jay M.; Chow, Jerry M. ^[1]; Liu, Yanbing; Houck, Andrew A. ^[2]

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1. IBM T.J. Watson Research Center, 1101 Kitchawan Road, Yorktown Heights, New York 10598 (United States)
2. Department of Electrical Engineering, Princeton University, Princeton, New Jersey 08544 (United States)

The ability to perform fast, high-fidelity readout of quantum bits (qubits) is essential to the goal of building a quantum computer. However, coupling a fast measurement channel to a superconducting qubit typically also speeds up its relaxation via spontaneous emission. Here, we use impedance engineering to design a filter by which photons may easily leave the resonator at the cavity frequency but not at the qubit frequency. We implement this broadband filter in both an on-chip and off-chip configuration.

• OSTI ID: 22485968
• Journal Information: Applied Physics Letters, Vol. 107, Issue 17; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
EMISSION
FILTERS
PHOTONS
QUANTUM COMPUTERS
QUANTUM ELECTRODYNAMICS
QUBITS
READOUT SYSTEMS
RELAXATION
RESONATORS