Measurements of quantum noise in resistively shunted Josephson junctions

Koch, R. H.; Harlingen, D. J. Van; Clarke, John

doi:10.1103/physrevb.26.74

Cited by 118 publications

(148 citation statements)

References 21 publications

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“…In a series of experiments, Koch et al (1980;1981;1982) Treating a coil of wire theoretically as an antenna, they argue that the antenna-like radiation resistance of the coil should be included in the total resistance of the circuit, and they suggest that it is this total resistance that should be used in the theoretical computation of the ZPF-induced voltage fluctuations. Because of the strong dependence of the radiation resistance on the number of coil turns (scaling quadratically), coil radius (quartic scaling), and frequency (quartic scaling), these enhanced ZPF-induced voltage fluctuations should be measurable in the laboratory at quite accessible frequencies (100 MHz compared to the 100 GHz range necessary in the Koch et al experiments).…”

Section: Voltage Fluctuations In Coils Induced By Zpf At High Frequencymentioning

confidence: 99%

Review of Experimental Concepts for Studying the Quantum Vacuum Field

Davis¹,

Teofilo

Haisch³

et al. 2006

AIP Conference Proceedings

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Abstract. We review concepts that provide an experimental framework for exploring the possibility and limitations of accessing energy from the space vacuum environment. Quantum electrodynamics (QED) and stochastic electrodynamics (SED) are the theoretical approaches guiding this experimental investigation. This investigation explores the question of whether the quantum vacuum field contains useful energy that can be exploited for applications under the action of a catalyst, or cavity structure, so that energy conservation is not violated. This is similar to the same technical problem at about the same level of technology as that faced by early nuclear energy pioneers who searched for, and successfully discovered, the unique material structure that caused the release of nuclear energy via the neutron chain reaction.

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Section: Voltage Fluctuations In Coils Induced By Zpf At High Frequencymentioning

confidence: 99%

Review of Experimental Concepts for Studying the Quantum Vacuum Field

Davis¹,

Teofilo

Haisch³

et al. 2006

AIP Conference Proceedings

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show abstract

“…So there is, in general, no reason to expect (4.4) to dominate. A heuristic quantum Langevin equation has been used for a system involving a shunted Josephson junction [3,[16][17][18][19][20]. Then Q is the Josephson angle, and with the constant coefficients satisfying I > I 0 .…”

Section: Nonlinear Q Systemsmentioning

confidence: 99%

Conditions for the validity of the quantum Langevin equation

Frenkel

Taylor

2012

Phys. Rev. E

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From microscopic models, a Langevin equation can, in general, be derived only as an approximation. Two possible conditions to validate this approximation are studied. One is, for a linear Langevin equation, that the frequency of the Fourier transform should be close to the natural frequency of the system. The other is by the assumption of "slow" variables. We test this method by comparison with an exactly soluble model and point out its limitations. We base our discussion on two approaches. The first is a direct, elementary treatment of Senitzky. The second is via a generalized Langevin equation as an intermediate step.

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“…It exhibits a broad peak arising from the non-linear coupling between the junction current noise and the ac-Josephson current. This mechanism is of particular interest for studying the high frequency (quantum) noise of a dissipative conductor by means of low frequency measurements [23]. Here the dissipative channel is perfectly coupled to the nonlinear oscillator since they are both part of the same junction.…”

mentioning

confidence: 99%

Divergence at Low Bias and Down-Mixing of the Current Noise in a Diffusive Superconductor–Normal-Metal–Superconductor Junction

et al. 2007

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We present current noise measurements in a long diffusive superconductor -normal metal -superconductor junction in the low voltage regime, in which transport can be partially described in terms of coherent multiple Andreev reflections. We show that, when decreasing voltage, the current noise exhibits a strong divergence together with a broad peak. We ascribe this peak to the mixing between the ac-Josephson current and the noise of the junction itself. We show that the junction noise corresponds to the thermal noise of a non-linear resistor 4kBT /R with R = V /I(V ) and no adjustable parameters.

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Measurements of quantum noise in resistively shunted Josephson junctions

Abstract: 3 LBL-l3326

Cited by 118 publications

References 21 publications

Review of Experimental Concepts for Studying the Quantum Vacuum Field

Review of Experimental Concepts for Studying the Quantum Vacuum Field

Conditions for the validity of the quantum Langevin equation

Divergence at Low Bias and Down-Mixing of the Current Noise in a Diffusive Superconductor–Normal-Metal–Superconductor Junction

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