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Controllable Coupling of Superconducting Flux Qubits
Open accessAbstract
We have realized controllable coupling between two three-junction flux qubits by inserting an additional coupler loop between them, containing three Josephson junctions. Two of these are shared with the qubit loops, providing strong qubit-coupler interaction. The third junction gives the coupler a nontrivial current-flux relation; its derivative (i.e., the susceptibility) determines the coupling strength J, which thus is tunable in situ via the coupler's flux bias. In the qubit regime, J was varied from approximately 45 (antiferromagnetic) to approximately -55 mK (ferromagnetic); in particular, J vanishes for an intermediate coupler bias. Measurements on a second sample illuminate the relation between two-qubit tunable coupling and three-qubit behavior.
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Citations
Cites
Quantum Computation with Untunable Couplings
Zhou, X., Zhou, Z.-W., Guo, G.-C., & Feldman, M. J. (2002) · Physical Review Letters · doi:10.1103/physrevlett.89.197903 · Cited by 76
Cited by
Ladd, T. D., Jelezko, F., Laflamme, R., Nakamura, Y., Monroe, C., & O’Brien, J. L. (2010) · Nature · doi:10.1038/nature08812 · Cited by 3,592
Microwave photonics with superconducting quantum circuits
Gu, X., Kockum, A. F., Miranowicz, A., Liu, Y.-X., & Nori, F. (2017) · Physics Reports · doi:10.1016/j.physrep.2017.10.002 · Cited by 1,307
On-chip quantum simulation with superconducting circuits
Houck, A. A., Türeci, H. E., & Koch, J. (2012) · Nature Physics · doi:10.1038/nphys2251 · Cited by 1,069
Tunable Coupling Scheme for Implementing High-Fidelity Two-Qubit Gates
Yan, F., Krantz, P., Sung, Y., Kjaergaard, M., Campbell, D. L., Orlando, T. P., Gustavsson, S., & Oliver, W. D. (2018) · Physical Review Applied · doi:10.1103/physrevapplied.10.054062 · Cited by 423
Universal Gate for Fixed-Frequency Qubits via a Tunable Bus
McKay, D. C., Filipp, S., Mezzacapo, A., Magesan, E., Chow, J. M., & Gambetta, J. M. (2016) · Physical Review Applied · doi:10.1103/physrevapplied.6.064007 · Cited by 321
Metadata
- Authors
- van der Ploeg, S. H. W., Izmalkov, A., van den Brink, A. M., Hübner, U., Grajcar, M., Il’ichev, E., Meyer, H.-G., & Zagoskin, A. M.
- Venue
- Physical Review Letters
- Publisher
- American Physical Society (APS)
- Published
- 2007-02-02
- Volume
- 98
- Issue
- 5
- Pages
- 057004-057004
- ISSN
- 0031-9007 (ISSN-L)
- 1079-7114
- OpenAlex
- W2033355092
- Cited by
- 188
- References
- 1
- FWCI
- 20.09
- Type
- journal article
- Language
- en
- Open access
- green
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- van der Ploeg, S. H. W., Izmalkov, A., van den Brink, A. M., Hübner, U., Grajcar, M., Il’ichev, E., Meyer, H.-G., & Zagoskin, A. M. (2007). Controllable Coupling of Superconducting Flux Qubits. Physical Review Letters. https://doi.org/10.1103/physrevlett.98.057004
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