Microwave irradiation and quasiparticles in a superconducting double dot

N. J. Lambert; A. A. Esmail; F. A. Pollock; M. Edwards; B. W. Lovett; A. J. Ferguson

doi:10.1103/PhysRevB.95.235413

Microwave irradiation and quasiparticles in a superconducting double dot

N. J. Lambert
, A. A. Esmail
, F. A. Pollock
, M. Edwards
, B. W. Lovett
, A. J. Ferguson

Research output: Contribution to journal › Article › peer-review

Abstract

We study the interaction of the charge states of a superconducting double dot, comprising two superconducting islands coupled by a Josephson junction, with microwaves between 2 and 55 GHz. We observe resonant transitions between even-parity charge states at relatively low frequencies and breaking of Cooper pairs under higher-frequency irradiation, allowing our device to act as a click detector for microwave photons. By applying a magnetic field and tuning the pair-breaking energy, we perform spectroscopy on the environment in our cryostat and determine the temperature of a nonequilibrium photon bath. Finally, we exploit the band structure of our device to break Cooper pairs dependent on the symmetry of the initial Cooper pair state.

Original language	English
Article number	235413
Number of pages	10
Journal	Physical Review. B, Condensed matter and materials physics
Volume	95
Issue number	23
Early online date	9 Jun 2017
DOIs	https://doi.org/10.1103/PhysRevB.95.235413
Publication status	Published - 15 Jun 2017

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MicrowaveInteractions
© 2017, American Physical Society. This work has been made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at journals.aps.org / https://doi.org/10.1103/PhysRevB.95.235413
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Entangling dopant nuclear spins: Entangling dopant nuclear spins using double quantum dots
Lovett, B. (PI)
EPSRC
1/09/13 → 31/08/17
Project: Standard

Cite this

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title = "Microwave irradiation and quasiparticles in a superconducting double dot",

abstract = "We study the interaction of the charge states of a superconducting double dot, comprising two superconducting islands coupled by a Josephson junction, with microwaves between 2 and 55 GHz. We observe resonant transitions between even-parity charge states at relatively low frequencies and breaking of Cooper pairs under higher-frequency irradiation, allowing our device to act as a click detector for microwave photons. By applying a magnetic field and tuning the pair-breaking energy, we perform spectroscopy on the environment in our cryostat and determine the temperature of a nonequilibrium photon bath. Finally, we exploit the band structure of our device to break Cooper pairs dependent on the symmetry of the initial Cooper pair state.",

author = "Lambert, \{N. J.\} and Esmail, \{A. A.\} and Pollock, \{F. A.\} and M. Edwards and Lovett, \{B. W.\} and Ferguson, \{A. J.\}",

note = "Funding: UK EPSRC EP/K025562.",

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doi = "10.1103/PhysRevB.95.235413",

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AU - Lambert, N. J.

AU - Esmail, A. A.

AU - Pollock, F. A.

AU - Edwards, M.

AU - Lovett, B. W.

AU - Ferguson, A. J.

N1 - Funding: UK EPSRC EP/K025562.

PY - 2017/6/15

Y1 - 2017/6/15

N2 - We study the interaction of the charge states of a superconducting double dot, comprising two superconducting islands coupled by a Josephson junction, with microwaves between 2 and 55 GHz. We observe resonant transitions between even-parity charge states at relatively low frequencies and breaking of Cooper pairs under higher-frequency irradiation, allowing our device to act as a click detector for microwave photons. By applying a magnetic field and tuning the pair-breaking energy, we perform spectroscopy on the environment in our cryostat and determine the temperature of a nonequilibrium photon bath. Finally, we exploit the band structure of our device to break Cooper pairs dependent on the symmetry of the initial Cooper pair state.

AB - We study the interaction of the charge states of a superconducting double dot, comprising two superconducting islands coupled by a Josephson junction, with microwaves between 2 and 55 GHz. We observe resonant transitions between even-parity charge states at relatively low frequencies and breaking of Cooper pairs under higher-frequency irradiation, allowing our device to act as a click detector for microwave photons. By applying a magnetic field and tuning the pair-breaking energy, we perform spectroscopy on the environment in our cryostat and determine the temperature of a nonequilibrium photon bath. Finally, we exploit the band structure of our device to break Cooper pairs dependent on the symmetry of the initial Cooper pair state.

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DO - 10.1103/PhysRevB.95.235413

M3 - Article

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JO - Physical Review. B, Condensed matter and materials physics

JF - Physical Review. B, Condensed matter and materials physics

IS - 23

M1 - 235413

ER -

Microwave irradiation and quasiparticles in a superconducting double dot

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Entangling dopant nuclear spins: Entangling dopant nuclear spins using double quantum dots

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