Journal
PHYSICAL REVIEW LETTERS
Volume 105, Issue 2, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.105.023601
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Funding
- NanoNed
- UPV-EHU [GIU07/40]
- Spanish MEC [FIS2009-12773-C02-01]
- EuroSQIP
- SOLID European projects [MEC FIS2006-04885, CSIC 200850I044]
- CSIC [JAE-PREDOC2009]
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We propose different designs of switchable coupling between a superconducting flux qubit and a microwave transmission line. They are based on two or more loops of Josephson junctions which are directly connected to a closed (cavity) or open transmission line. In both cases the circuit induces a coupling that can be modulated in strength, reaching the so-called ultrastrong coupling regime in which the coupling is comparable to the qubit and photon frequencies. Furthermore, we suggest a wide set of applications for the introduced architectures.
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