Non-classical current noise and light emission of an ac-driven tunnel junction

Zhan, Hongxin; Rastelli, Gianluca; Belzig, Wolfgang

doi:10.1088/1367-2630/ab83d8

Cited by 4 publications

(4 citation statements)

References 76 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This approach provides a quasi-classical theory for noise represented as symmetrized correlators due to the Keldysh time ordering. The non-Gaussian fluctuations effects are the intriguing direction of recent studies related to non-linear quantum environment 35 and dynamical Coulomb blockade 55 ; in particular, the possibility of different time orderings on the Keldysh contour becomes important in the description of quantum noise and nonsymmetrized correlators.…”

Section: Discussion and Outlookmentioning

confidence: 99%

Transport of pseudothermal photons through an anharmonic cavity

Shapiro

2021

Sci Rep

View full text Add to dashboard Cite

Under nonequilibrium conditions, quantum optical systems reveal unusual properties that might be distinct from those in condensed matter. The fundamental reason is that photonic eigenstates can have arbitrary occupation numbers, whereas in electronic systems these are limited by the Pauli principle. Here, we address the steady-state transport of pseudothermal photons between two waveguides connected through a cavity with Bose–Hubbard interaction between photons. One of the waveguides is subjected to a broadband incoherent pumping. We predict a continuous transition between the regimes of Lorentzian and Gaussian chaotic light emitted by the cavity. The rich variety of nonequilibrium transport regimes is revealed by the zero-frequency noise. There are three limiting cases, in which the noise-current relation is characterized by a power-law, $$S\propto J^\gamma$$ S ∝ J γ . The Lorentzian light corresponds to Breit-Wigner-like transmission and $$\gamma =2$$ γ = 2 . The Gaussian regime corresponds to many-body transport with the shot noise ($$\gamma =1$$ γ = 1 ) at large currents; at low currents, however, we find an unconventional exponent $$\gamma =3/2$$ γ = 3 / 2 indicating a nontrivial interplay between multi-photon transitions and incoherent pumping. The nonperturbative solution for photon dephasing is obtained in the framework of the Keldysh field theory and Caldeira-Leggett effective action. These findings might be relevant for experiments on photon blockade in superconducting qubits, thermal states transfer, and photon statistics probing.

show abstract

Section: Discussion and Outlookmentioning

confidence: 99%

Transport of pseudothermal photons through an anharmonic cavity

Shapiro

2021

Sci Rep

View full text Add to dashboard Cite

show abstract

“…This approach provides a quasi-classical theory for noise represented as symmetrized correlators due to the Keldysh time ordering. The non-Gaussian fluctuations effects are the intriguing direction of recent studies related to non-linear quantum environment 32 and dynamical Coulomb blockade 52 ; in particular, the possibility of different time orderings on the Keldysh contour becomes important in the description of quantum noise and nonsymmetrized correlators.…”

Section: Discussion and Outlookmentioning

confidence: 99%

Transport of pseudothermal photons through an anharmonic cavity

Shapiro

2020

Preprint

View full text Add to dashboard Cite

Under nonequilibrium conditions, quantum optical systems reveal unusual properties that might be distinct from that in condensed matter. The fundamental reason is that photonic eigenstates can have an arbitrary occupation, in contrast to electronic systems where it is limited by the Pauli principle. Here, we address a steady-state transport of pseudothermal photons between two waveguides connected through a cavity with Bose-Hubbard interaction when one of the waveguides is subjected to a broadband incoherent pump. We found a continuous transition between the regimes of Lorentzian and Gaussian chaotic light emitted by the cavity. The nonequilibrium transport reveals a rich behavior of zero-frequency noise. There are three limiting cases where noise-current relation becomes power-law as S ∝ J γ . The Lorentzian light corresponds to Breit-Wigner-like transmission and thermal noise with γ = 2; the Gaussian regime corresponds to many-body transport with a shot noise (γ = 1) at large currents. At low currents, however, we find unconventional exponent γ = 3/2 indicating for a nontrivial interplay between multi-photon transitions and incoherent pump. The nonperturbative solution for photons' dephasing is obtained in a framework of the Keldysh field theory and Caldeira-Leggett effective action. These findings might be relevant to experiments on photon blockade in superconducting qubits, thermal states transfer, and photons statistics probing.

show abstract

“…Time-dependent (TD) transport presents a powerful probe of quantum phenomena by introducing multiple parameters or functions under control: frequencies for emitted noise generated by constant forces, or TD forces generating current or noise at low or finite frequencies [1][2][3][4][5][6]. It has been analyzed in a mesoscopic context through seminal theoretical approaches, such as the Tien-Gordon theory [7][8][9][10] or the Landauer-Büttiker scattering approach, associated with the Floquet theory [11][12][13][14][15][16][17]. The effect of a periodic ac voltage V ac (t ) at a frequency 0 is often addressed within the so-called lateral-band transmission scheme, where V ac (t ) is viewed as a coherent radiation with translates one electron energy by l 0 for each integer number l of exchanged photons.…”

Section: Introductionmentioning

confidence: 99%

Driven strongly correlated quantum circuits and Hall edge states: Unified photoassisted noise and revisited minimal excitations

Safi

2022

Phys. Rev. B

View full text Add to dashboard Cite

We study the photoassisted shot noise (PASN) generated by time-dependent (TD) or random sources and transmission amplitudes. We show that it obeys a perturbative nonequilibrium (NEQ) fluctuation relation (FR) that fully extends the lateral-band transmission picture in terms of many-body correlated states. This FR holds in NEQ strongly correlated systems such as the integer or fractional quantum Hall regime as well as in quantum circuits formed by a normal or a Josephson junction (JJ) strongly coupled to an electromagnetic environment, with a possible temperature bias. We then show that the PASN is universally super-Poissonian, giving an alternative to a theorem by L. Levitov et al. which states that an ac voltage increases the noise. We show that this theorem is restricted to a linear dc current and that it does not apply to a nonlinear SIS (superconductor-insulatorsuperconductor) junction. Then we characterize minimal excitations in nonlinear conductors as those which ensure a Poissonian PASN, and show that these can carry a nontrivial charge value in the fractional quantum Hall regime. We also propose methods for shot noise spectroscopy and for a robust determination of the fractional charge which complement those we have proposed previously and that have been implemented experimentally

show abstract

Non-classical current noise and light emission of an ac-driven tunnel junction

Cited by 4 publications

References 76 publications

Transport of pseudothermal photons through an anharmonic cavity

Transport of pseudothermal photons through an anharmonic cavity

Transport of pseudothermal photons through an anharmonic cavity

Driven strongly correlated quantum circuits and Hall edge states: Unified photoassisted noise and revisited minimal excitations

Contact Info

Product

Resources

About