Time‐Domain Spectroscopy of Mesoscopic Conductors Using Voltage Pulses (Adv. Quantum Technol. 3‐4/2019)

Burset, Pablo; Kotilahti, Janne; Moskalets, Michael; Flindt, Christian

doi:10.1002/qute.201970023

Cited by 3 publications

(4 citation statements)

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“…46 In dynamic, periodically driven systems, waiting-time distributions are clear indicators of regular single-electron transport. [49][50][51][52] Furthermore, waiting-time distributions were used in a recent experiment 53 to optimize singleelectron spin-readout fidelity.…”

Section: Introductionmentioning

confidence: 99%

Waiting time distributions in a two-level fluctuator coupled to a superconducting charge detector

Jenei

Potaņina

Zhao

et al. 2019

Phys. Rev. Research

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We analyze charge fluctuations in a parasitic state strongly coupled to a superconducting Josephson-junction-based charge detector. The charge dynamics of the state resembles that of electron transport in a quantum dot with two charge states, and hence we refer to it as a two-level fluctuator. By constructing the distribution of waiting times from the measured detector signal and comparing it with a waiting time theory, we extract the electron in-and out-tunneling rates for the two-level fluctuator, which are severely asymmetric. arXiv:1909.02866v2 [cond-mat.mes-hall]

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Section: Introductionmentioning

confidence: 99%

Waiting time distributions in a two-level fluctuator coupled to a superconducting charge detector

Jenei

Potaņina

Zhao

et al. 2019

Phys. Rev. Research

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“…The setup can include more than two single-particle emitters, and the individual emitters may be of different types. For example, the combination of a leviton source with a quantum capacitor is within experimental reach, and it would enable the use of one source to characterize the other [82].…”

Section: Discussionmentioning

confidence: 99%

“…The scattering amplitude is the phase factor, S in (t) = exp[−i (e/ ) t −∞ dt V (t )], where V (t) is the time-dependent voltage [50]. If the voltage is a sequence of Lorentzian voltage pulses of a definite amplitude [74,75,76,77,78,79,80,81,82,83],…”

Section: Levitonsmentioning

confidence: 99%

Composite two-particle sources

Moskalets

Kotilahti

Burset

et al. 2020

Eur. Phys. J. Spec. Top.

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Multi-particle sources constitute an interesting new paradigm following the recent development of on-demand single-electron sources. Versatile devices can be designed using several single-electron sources, possibly of different types, coupled to the same quantum circuit. However, if combined non-locally to avoid cross-talk, the resulting architecture becomes very sensitive to electronic decoherence. To circumvent this problem, we here analyse two-particle sources that operate with several single-electron (or hole) emitters attached in series to the same electronic waveguide. We demonstrate how such a device can emit exactly two electrons without exciting unwanted electron-hole pairs if the driving is adiabatic. Going beyond the adiabatic regime, perfect two-electron emission can be achieved by driving two quantum dot levels across the Fermi level of the external reservoir. If a single-electron source is combined with a source of holes, the emitted particles can annihilate each other in a process which is governed by the overlap of their wave functions. Importantly, the degree of annihilation can be controlled by tuning the emission times, and the overlap can be determined by measuring the shot noise after a beam splitter. In contrast to a Hong-Ou-Mandel experiment, the wave functions overlap close to the emitters and not after propagating to the beam splitter, making the shot noise reduction less susceptible to electronic decoherence. a

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“…We need an energy independent

in order to use noise to get information on injected wave packets only. If the properties of the electronic circuit that connects the incoming and outgoing channels do depend on energy, the outgoing signal also carries nontrivial information about the circuit [ 59 ].…”

Section: Electrical Noise and Electron Correlation Functionmentioning

confidence: 99%

Auto- versus Cross-Correlation Noise in Periodically Driven Quantum Coherent Conductors

Moskalets¹

2021

Entropy

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Expressing currents and their fluctuations at the terminals of a multi-probe conductor in terms of the wave functions of carriers injected into the Fermi sea provides new insight into the physics of electric currents. This approach helps us to identify two physically different contributions to shot noise. In the quantum coherent regime, when current is carried by non-overlapping wave packets, the product of current fluctuations in different leads, the cross-correlation noise, is determined solely by the duration of the wave packet. In contrast, the square of the current fluctuations in one lead, the autocorrelation noise, is additionally determined by the coherence of the wave packet, which is associated with the spread of the wave packet in energy. The two contributions can be addressed separately in the weak back-scattering regime, when the autocorrelation noise depends only on the coherence. Analysis of shot noise in terms of these contributions allows us, in particular, to predict that no individual traveling particles with a real wave function, such as Majorana fermions, can be created in the Fermi sea in a clean manner, that is, without accompanying electron–hole pairs.

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Time‐Domain Spectroscopy of Mesoscopic Conductors Using Voltage Pulses (Adv. Quantum Technol. 3‐4/2019)

Cited by 3 publications

References 0 publications

Waiting time distributions in a two-level fluctuator coupled to a superconducting charge detector

Waiting time distributions in a two-level fluctuator coupled to a superconducting charge detector

Composite two-particle sources

Auto- versus Cross-Correlation Noise in Periodically Driven Quantum Coherent Conductors

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