Superconducting quantum computing
Encyclopedia
Superconducting quantum computing is a promising implementation of quantum information
that involves nanofabricated superconducting electrode
s coupled through Josephson junctions
. As in a superconducting electrode, the phase and the charge are conjugate variables, there exists three families of superconducting qubits, depending if the charge, the phase or neither of the two are good quantum numbers. This refers respectively to charge qubit
s, flux qubit
s, and hybrid qubits.
Quantum information
In quantum mechanics, quantum information is physical information that is held in the "state" of a quantum system. The most popular unit of quantum information is the qubit, a two-level quantum system...
that involves nanofabricated superconducting electrode
Electrode
An electrode is an electrical conductor used to make contact with a nonmetallic part of a circuit...
s coupled through Josephson junctions
Josephson effect
The Josephson effect is the phenomenon of supercurrent across two superconductors coupled by a weak link...
. As in a superconducting electrode, the phase and the charge are conjugate variables, there exists three families of superconducting qubits, depending if the charge, the phase or neither of the two are good quantum numbers. This refers respectively to charge qubit
Charge qubit
In quantum computing, a charge qubit is a superconducting qubit whose basis states are charge states . A charge qubit is formed by a tiny superconducting island coupled by a Josephson junction to a superconducting reservoir...
s, flux qubit
Flux qubit
In quantum computing, flux qubits are micrometer sized loops of superconducting metal interrupted by a number of Josephson junctions. The junction parameters are engineered during fabrication so that a persistent current will flow continuously when an external flux is applied...
s, and hybrid qubits.
Journal articles on superconducting qubits
- V. Bouchiat, D. Vion, P. Joyez, D. Esteve and M.H. Devoret, "Quantum coherence with a single Cooper pair," Physica Scripta T76 165 (1998), doi:10.1238/Physica.Topical.076a00165
- Y. Nakamura, Yu. A. Pashkin and J. S. Tsai, "Coherent control of macroscopic quantum states in a single-Cooper-pair box," Nature 398, 786 (1999), doi:10.1038/19718
- Yu. Makhlin, G. Schön and A. Shnirman, "Quantum-state engineering with Josephson-junction devices," Rev. Mod. Phys. 73, 357 (2001), arXiv:cond-mat/0011269, doi: 10.1103/RevModPhys.73.357
- D. Vion, A. Aassime, A. Cottet, P. Joyez, H. Pothier, C. Urbina, D. Esteve and M. H. Devoret, "Manipulating the quantum state of an electrical circuit," Science 296, 886 (2002), doi:10.1126/science.1069372
- J. M. Martinis, S. Nam, J. Aumentado and C. Urbina, "Rabi oscillations in a large Josephson-junction qubit," Phys. Rev. Lett. 89, 117901 (2002), doi:10.1103/PhysRevLett.89.117901
- I. Chiorescu, Y. Nakamura, C. J. P. M. Harmans and J. E. Mooij, "Coherent quantum dynamics of a superconducting flux qubit," Science 299, 1869 (2003), doi:10.1126/science.1081045
- T. Duty, D. Gunnarsson, K. Bladh and P. Delsing, "Coherent dynamics of a Josephson charge qubit," Phys. Rev. B 69, 140503(R) (2004), doi:10.1103/PhysRevB.69.140503
- A. Wallraff, D. I. Schuster, A. Blais, L. Frunzio, R.-S. Huang, J. Majer, S. Kumar, S. M. Girvin and R. J. Schoelkopf, "Strong coupling of a single photon to a superconducting qubit using circuit quantum electrodynamics," Nature 431, 162 (2004), doi:10.1038/nature02851
- M.H. Devoret, A. Wallraff and J.M. Martinis, "Superconducting qubits: A short review," arXiv:cond-mat/0411174 (2004)
- J.Q. You and F. Nori, "Superconducting circuits and quantum information," Physics Today 58, 42 (2005), doi:10.1063/1.2155757
- A. Zagoskin and A. Blais, "Superconducting qubits," Physics in Canada 63, 215 (2007), arxiv:0805.0164