John Clarke et al 2002 Phys. Scr. 2002 173 doi:10.1238/Physica.Topical.102a00173
Quiet Readout of Superconducting Flux States
John Clarke1,2, T L Robertson1,2, B L T Plourde1,2, A García-Martinez1,2, P A Reichardt1,2, D J Van Harlingen1,2,3, B Chesca4, R Kleiner4, Y Makhlin5, G Schön5, A Shnirman5 and F K Wilhelm6
Show affiliationsThe INSQUID (INductive Superconducting QUantum Interference Device) can measure the flux state of a superconducting qubit rapidly, while allowing the quantum state of the qubit to evolve with low levels of back action. The INSQUID consists of a dc SQUID with unshunted junctions connected in parallel with a superconducting inductor; the qubit is placed inside the SQUID loop. The inductor is coupled to a readout dc SQUID with resistively-shunted junctions. By applying appropriate fluxes to the input SQUID and the inductor, the INSQUID can be turned "off", so that virtually no flux noise is coupled from the readout SQUID to the qubit. Different flux biases turn the INSQUID "on", enabling the readout SQUID to measure the flux state of the qubit. The INSQUID can also be used to turn on and off the coupling between two or more qubits.
- PACS
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85.25.Dq Superconducting quantum interference devices (SQUIDs)
- Subjects
- Dates
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Issue T102 (2002)
Received 25 January 2002
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Quiet Readout of Superconducting Flux States
John Clarke et al 2002 Phys. Scr. 2002 173
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