Resolving photon number states in a superconducting circuit

D. I. Schuster, A. A. Houck, J. A. Schreier, A. Wallraff, J. M. Gambetta, A. Blais, L. Frunzio, J. Majer, B. Johnson, M. H. Devoret, S. M. Girvin and R. J. Schoelkopf ()
Additional contact information
D. I. Schuster: Yale University
A. A. Houck: Yale University
J. A. Schreier: Yale University
A. Wallraff: Yale University
J. M. Gambetta: Yale University
A. Blais: Yale University
L. Frunzio: Yale University
J. Majer: Yale University
B. Johnson: Yale University
M. H. Devoret: Yale University
S. M. Girvin: Yale University
R. J. Schoelkopf: Yale University

Nature, 2007, vol. 445, issue 7127, 515-518

Abstract: Count on qubits In cavity quantum electrodynamics (QED), atoms or quantum dots are made to strongly interact with single photons. Recent work showed that a regime of 'strong coupling' can be obtained, where a single photon is absorbed and re-emitted many times. Schuster et al. have built a special type of cavity QED system that is embedded within an electronic circuit; in it a superconducting quantum bit (qubit) interacts with photons from a microwave transmission line. A novel regime can be produced in this system, namely the strong dispersive limit, where a single photon has a large effect on the qubit without being absorbed. This opens the possibility of nondestructive counting of photons that are present in the cavity. This effect could be used as a basis for qubit–photon conditional logic, a requirement for quantum computing.

Date: 2007
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DOI: 10.1038/nature05461

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