On the low-frequency current noise in metals

Kogan, Sh. M.; Nagaev, K. É.

doi:10.1016/0038-1098(84)90593-3

Cited by 53 publications

(20 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Environmental effects due to a collection of bistable fluctuators have been experimentally observed in nanoscale electronic devices, where the single electron tunnelling turns out to be affected by charge fluctuations [62,63]. Our results may be thus used as a valid guideline to analyze decoherence phenomena in Josephson circuits subject to noise stemming from fluctuating background charges and flux [64][65][66][67].…”

Section: Introductionmentioning

confidence: 91%

Dynamics of quantum correlations in colored-noise environments

et al. 2013

View full text Add to dashboard Cite

We address the dynamics of entanglement and quantum discord for two noninteracting qubits initially prepared\ud in a maximally entangled state and then subjected to a classical colored noise, i.e., coupled with an external\ud environment characterized by a noise spectrum of the form 1/f α.More specifically, we address systems in which\ud the Gaussian approximation fails, i.e., mere knowledge of the spectrum is not enough to determine the dynamics\ud of quantum correlations. We thus investigate the dynamics for two different configurations of the environment:\ud in the first case, the noise spectrum is due to the interaction of each qubit with a single bistable fluctuator with\ud an undetermined switching rate, whereas in the second case we consider a collection of classical fluctuators with\ud fixed switching rates. In both cases, we found analytical expressions for the time dependence of entanglement\ud and quantum discord, which may also be extended to a collection of fluctuators with random switching rates.\ud The environmental noise is introduced by means of stochastic time-dependent terms in the Hamiltonian, and this\ud allows us to describe the effects of both separate and common environments. We show that the non-Gaussian\ud character of the noise may lead to significant effects, e.g., environments with the same power spectrum, but\ud different configurations give rise to the opposite behavior for quantum correlations. In particular, depending\ud on the characteristics of the environmental noise considered, both entanglement and discord display either a\ud monotonic decay or the phenomena of sudden death and revivals. Our results show that the microscopic structure\ud of the environment, in addition to its noise spectrum, is relevant for the dynamics of quantum correlations and\ud may be a valid starting point for the engineering of non-Gaussian colored environments

show abstract

Section: Introductionmentioning

confidence: 91%

Dynamics of quantum correlations in colored-noise environments

et al. 2013

View full text Add to dashboard Cite

show abstract

“…Noises with 1/f α spectra are found when the environment can be described as a collection of N f random bistable fluctuators, with N f ≥ 1. It affects solid-state devices, superconducting qubits, and magnetic systems [38][39][40][41][42][43]. The dynamical map of a qubit interacting with these kind of environments describes pure dephasing.…”

Section: Introductionmentioning

confidence: 99%

Non-Markovianity of colored noisy channels

2014

View full text Add to dashboard Cite

We address the non-Markovian character of quantum maps describing the interaction of a qubit with a random classical field. In particular, we evaluate trace-and capacity-based non-Markovianity measures for two relevant classes of environments showing non-Gaussian fluctuations, described respectively by random telegraph noise and colored noise with spectra of the the form 1/f α . We analyze the dynamics of both the trace distance and the quantum capacity, and show that the behavior of non-Markovianity based on both measures is qualitatively similar. Our results show that environments with a spectrum that contains a relevant low-frequency contribution are generally non-Markovian. We also find that the non-Markovianity of colored environments decreases when the number of fluctuators realizing the environment increases.

show abstract

“…These defects switch between two possible configurations and cause the "telegraph" resistance noise in small contacts. In metallic systems they are believed to be related to structural defects which at low temperatures are seen as the wellknown two-level systems [3][4][5][6][7][8] . We would also like to mention works where the two-level fluctuation studied exists in atomic size contacts produced with help of the breakjunction method 9 .…”

Section: Introductionmentioning

confidence: 99%

Fluctuators in disordered metallic point contacts: a simulation approach

Козуб

Oligschleger

1998

J. Phys.: Condens. Matter

View full text Add to dashboard Cite

Electron transport through amorphous monatomic metallic structures generated earlier by molecular dynamics simulations is studied numerically. The interference of electronic trajectories backscattered by the structural disorder probes the multistable structural relaxations responsible for lowfrequency noise in real metallic contacts. The structure of these modes is visualized; the dependence of noise magnitude on size and structure of the modes is studied. The transition from multistable behaviour to a more complex one is observed for temperatures far below the melting temperature. The current fluctuations observed numerically resemble the complex behaviour reported earlier for current noise in small metallic structures at moderate temperatures. PACS 72. 10-d, 72.70+m

show abstract

On the low-frequency current noise in metals

Cited by 53 publications

References 6 publications

Dynamics of quantum correlations in colored-noise environments

Dynamics of quantum correlations in colored-noise environments

Non-Markovianity of colored noisy channels

Fluctuators in disordered metallic point contacts: a simulation approach

Contact Info

Product

Resources

About