http://www.cnr.it/ontology/cnr/individuo/prodotto/ID18829
Resolving photon number states in a superconducting circuit (Articolo in rivista)
- Type
- Label
- Resolving photon number states in a superconducting circuit (Articolo in rivista) (literal)
- Anno
- 2007-01-01T00:00:00+01:00 (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
- 10.1038/nature05461 (literal)
- Alternative label
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 (2007)
Resolving photon number states in a superconducting circuit
in Nature (Lond.); NATURE PUBLISHING GROUP,, LONDON (Regno Unito)
(literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
- 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 (literal)
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- ISI Web of Science (WOS) (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
- Departments of Applied Physics and Physics, Yale University, New Haven, Connecticut 06520, USA. (literal)
- Titolo
- Resolving photon number states in a superconducting circuit (literal)
- Abstract
- Electromagnetic signals are always composed of photons,
although in the circuit domain those signals are carried as voltages
and currents on wires, and the discreteness of the photon's energy
is usually not evident. However, by coupling a superconducting
quantum bit (qubit) to signals on a microwave transmission line, it
is possible to construct an integrated circuit in which the presence
or absence of even a single photon can have a dramatic effect. Such
a system can be described by circuit quantum electrodynamics
(QED)--the circuit equivalent of cavity QED, where photons
interact with atoms or quantum dots. Previously, circuit QED
devices were shown to reach the resonant strong coupling regime,
where a single qubit could absorb and re-emit a single photon
many times. Here we report a circuit QED experiment in the
strong dispersive limit, a new regime where a single photon has
a large effect on the qubit without ever being absorbed. The hallmark
of this strong dispersive regime is that the qubit transition
energy can be resolved into a separate spectral line for each photon
number state of the microwave field. The strength of each line is a
measure of the probability of finding the corresponding photon
number in the cavity. This effect is used to distinguish between
coherent and thermal fields, and could be used to create a photon
statistics analyser. As no photons are absorbed by this process, it
should be possible to generate non-classical states of light by measurement
and perform qubit-photon conditional logic, the basis
of a logic bus for a quantum computer. (literal)
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