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Resolving Vacuum Fluctuations in an Electrical Circuit by Measuring the Lamb Shift

Fragner, A ; Göppl, M ; Fink, J.M ; Baur, M ; Bianchetti, R ; Leek, P.J ; Blais, A ; Wallraff, A

Science (American Association for the Advancement of Science), 2008-11, Vol.322 (5906), p.1357-1360 [Periódico revisado por pares]

Washington, DC: American Association for the Advancement of Science

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Título:
Resolving Vacuum Fluctuations in an Electrical Circuit by Measuring the Lamb Shift
Autor: Fragner, A ; Göppl, M ; Fink, J.M ; Baur, M ; Bianchetti, R ; Leek, P.J ; Blais, A ; Wallraff, A
Assuntos: Atoms & subatomic particles ; Circuits ; Electric fields ; Electromagnetism ; Exact sciences and technology ; Fundamental areas of phenomenology (including applications) ; Line spectra ; Magnetic fields ; Magnetic flux ; Microwave resonance ; Optics ; Photons ; Physics ; Quantum electrodynamics ; Quantum optics ; Quantum physics ; Resonators ; Specific theories and interaction models; particle systematics ; Spectroscopy ; Stark effect ; The physics of elementary particles and fields ; Transmission lines ; Vacuum technology
É parte de: Science (American Association for the Advancement of Science), 2008-11, Vol.322 (5906), p.1357-1360
Notas: ObjectType-Article-1
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Descrição: Quantum theory predicts that empty space is not truly empty. Even in the absence of any particles or radiation, in pure vacuum, virtual particles are constantly created and annihilated. In an electromagnetic field, the presence of virtual photons manifests itself as a small renormalization of the energy of a quantum system, known as the Lamb shift. We present an experimental observation of the Lamb shift in a solid-state system. The strong dispersive coupling of a superconducting electronic circuit acting as a quantum bit (qubit) to the vacuum field in a transmission-line resonator leads to measurable Lamb shifts of up to 1.4% of the qubit transition frequency. The qubit is also observed to couple more strongly to the vacuum field than to a single photon inside the cavity, an effect that is explained by taking into account the limited anharmonicity of the higher excited qubit states.
Editor: Washington, DC: American Association for the Advancement of Science
Idioma: Inglês

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Resolving Vacuum Fluctuations in an Electrical Circuit by Measuring the Lamb Shift

Fragner, A ; Göppl, M ; Fink, J.M ; Baur, M ; Bianchetti, R ; Leek, P.J ; Blais, A ; Wallraff, A

Washington, DC: American Association for the Advancement of Science

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