Amplification and squeezing of quantum noise with a tunable Josephson metamaterial

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dc.creatorCastellanos-Beltran, M. A.
dc.creatorIrwin, K. D.
dc.creatorHilton, G. C.
dc.creatorVale, L. R.
dc.creatorLehnert, K. W.
dc.date2008-06-04
dc.date.accessioned2026-07-07T12:37:08Z
dc.date.available2026-07-07T12:37:08Z
dc.descriptionIt has recently become possible to encode the quantum state of superconducting qubits and the position of nanomechanical oscillators into the states of microwave fields. However, to make an ideal measurement of the state of a qubit, or to detect the position of a mechanical oscillator with quantum-limited sensitivity requires an amplifier that adds no noise. If an amplifier adds less than half a quantum of noise, it can also squeeze the quantum noise of the electromagnetic vacuum. Highly squeezed states of the vacuum serve as an important quantum information resource. They can be used to generate entanglement or to realize back-action-evading measurements of position. Here we introduce a general purpose parametric device, which operates in a frequency band between 4 and 8 GHz. It is a subquantum-limited microwave amplifier, it amplifies quantum noise above the added noise of commercial amplifiers, and it squeezes quantum fluctuations by 10 dB.
dc.description13 pages, 4 figures
dc.identifierhttps://arxiv.org/abs/0806.0659
dc.identifierhttp://arxiv.org/abs/0806.0659
dc.identifierAmplification and squeezing of quantum noise with a tunable Josephson metamaterial, (letter) M. A. Castellanos-Beltran, K. D. Irwin, G. C. Hilton, L. R. Vale and K. W. Lehnert, Nature Physics, 4, 929 (2008).
dc.identifierdoi:10.1038/nphys1090
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/218336
dc.subjectMesoscale and Nanoscale Physics
dc.subjectSuperconductivity
dc.titleAmplification and squeezing of quantum noise with a tunable Josephson metamaterial
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