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Quantum Coherence with a Single Cooper Pair
Abstract
A metallic electrode connected to electron reservoirs by tunnel junctions has a series of charge states corresponding to the number of excess electrons in the electrode. In contrast with the charge state of an atomic or molecular ion, the charge states of such an “island” involve a macroscopic number of conduction electrons of the island. Island charge states bear some resemblance with the photon number states of the cavity in cavity QED, the phase conjugate to the number of electrons being analogous to the phase of the field in the cavity. For a normal island, charge states decay irreversibly into charge states of lower energies. However, the ground state of a superconducting island connected to superconducting reservoirs can be a coherent superposition of charge states differing by two electrons (i.e. a Cooper pair). We describe an experiment in which this Josephson effect involving only one Cooper pair is measured.
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Citations
Cited by
Strong coupling of a single photon to a superconducting qubit using circuit quantum electrodynamics
Wallraff, A., Schuster, D. I., Blais, A., Frunzio, L., Huang, R. S., Majer, J., Kumar, S., Girvin, S. M., & Schoelkopf, R. J. (2004) · Nature · doi:10.1038/nature02851 · Cited by 3,796
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
Charge-insensitive qubit design derived from the Cooper pair box
Koch, J., Yu, T. M., Gambetta, J., Houck, A. A., Schuster, D. I., Majer, J., Blais, A., Devoret, M. H., Girvin, S. M., & Schoelkopf, R. J. (2007) · Physical Review A · doi:10.1103/physreva.76.042319 · Cited by 3,351
Self-citationBlais, A., Huang, R.-S., Wallraff, A., Girvin, S. M., & Schoelkopf, R. J. (2004) · Physical Review A · doi:10.1103/physreva.69.062320 · Cited by 2,989
Coherent control of macroscopic quantum states in a single-Cooper-pair box
Nakamura, Y., Pashkin, Y. A., & Tsai, J. S. (1999) · Nature · doi:10.1038/19718 · Cited by 2,380
Metadata
- Authors
- Bouchiat, V., Vion, D., Joyez, P., Esteve, D., & Devoret, M. H.
- Venue
- Physica Scripta
- Publisher
- IOP Publishing
- Published
- 1998
- Volume
- T76
- Issue
- 1
- Pages
- 165
- ISSN
- 0031-8949 (ISSN-L)
- OpenAlex
- W2047184273
- Cited by
- 566
- References
- 0
- FWCI
- 18.82
- Type
- journal article
- Language
- en
- Open access
- closed
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- CoChat. (2026). Citation check: Quantum Coherence with a Single Cooper Pair. https://app.cochat.ai/papers/10.1238/physica.topical.076a00165
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- Bouchiat, V., Vion, D., Joyez, P., Esteve, D., & Devoret, M. H. (1998). Quantum Coherence with a Single Cooper Pair. Physica Scripta. https://doi.org/10.1238/physica.topical.076a00165
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Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).
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