Photoassisted Andreev reflection as a probe of quantum noise

Nguyen, Thi Kim Thanh; Jonckheere, Thibaut; Crépieux, Adeline; Nguyen, A.; Martin, Thierry

doi:10.1103/physrevb.76.035421

Cited by 4 publications

(4 citation statements)

References 30 publications

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“…This demonstrates that circuit QED techniques provide accurate tools to revisit the physics of photon-assisted tunneling. Note that despite longstanding theoretical interest [50][51][52][53][54][55][56][57][58][59], our work represents the first experimental study of photon-assisted tunneling between a quantum dot and a superconductor.…”

Section: Fig 5 Conductance G and Microwave Amplitudementioning

confidence: 99%

“…However, quantum dot circuits with superconducting reservoirs have been coupled neither to microwave cavities nor to a direct ac excitation, so far. Despite this lack of experiments, photon-assisted tunneling between a dot and a superconductor has created theoretical interest for more than 15 years [50][51][52][53][54][55][56][57][58][59]. The coupling between superconductor-quantum dot hybrid circuits and microwave cavities has also been studied in recent theoretical works [25][26][27].…”

Section: Introductionmentioning

confidence: 99%

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Cavity Photons as a Probe for Charge Relaxation Resistance and Photon Emission in a Quantum Dot Coupled to Normal and Superconducting Continua

et al. 2016

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Microwave cavities have been widely used to investigate the behavior of closed few-level systems. Here, we show that they also represent a powerful probe for the dynamics of charge transfer between a discrete electronic level and fermionic continua. We have combined experiment and theory for a carbon nanotube quantum dot coupled to normal metal and superconducting contacts. In equilibrium conditions, where our device behaves as an effective quantum dot-normal metal junction, we approach a universal photon dissipation regime governed by a quantum charge relaxation effect. We observe how photon dissipation is modified when the dot admittance turns from capacitive to inductive. When the fermionic reservoirs are voltage biased, the dot can even cause photon emission due to inelastic tunneling to/from a BardeenCooper-Schrieffer peak in the density of states of the superconducting contact. We can model these numerous effects quantitatively in terms of the charge susceptibility of the quantum dot circuit. This validates an approach that could be used to study a wide class of mesoscopic QED devices.

show abstract

Section: Fig 5 Conductance G and Microwave Amplitudementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Cavity Photons as a Probe for Charge Relaxation Resistance and Photon Emission in a Quantum Dot Coupled to Normal and Superconducting Continua

et al. 2016

View full text Add to dashboard Cite

show abstract

“…This demonstrates that circuit QED techniques provide accurate tools to revisit the physics of photon-assisted tunneling. Note that despite long-standing theoretical interest [50][51][52][53][54][55][56][57][58][59] , our work represents the first experimental study of photon-assisted tunneling between a quantum dot and a superconductor.…”

Section: (E)mentioning

confidence: 99%

“…However, quantum dot circuits with superconducting reservoirs have been coupled neither to microwave cavities nor to a direct AC excitation, so far. Despite this lack of experiments, photon-assisted tunneling between a dot and a superconductor has raised theoretical interest for more than 15 years [50][51][52][53][54][55][56][57][58][59] . The coupling between superconductor/quantum dot hybrid circuits and microwave cavities has also been studied in recent theory works [25][26][27] .…”

Section: Introductionmentioning

confidence: 99%

Cavity photons as a probe for charge relaxation resistance and photon emission in a quantum dot coupled to normal and superconducting continua

Bruhat,

Viennot,

Dartiailh

et al. 2016

Preprint

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Microwave cavities have been widely used to investigate the behavior of closed few-level systems.Here, we show that they also represent a powerful probe for the dynamics of charge transfer between a discrete electronic level and fermionic continua. We have combined experiment and theory for a carbon nanotube quantum dot coupled to normal metal and superconducting contacts. In equilibrium conditions, where our device behaves as an effective quantum dot-normal metal junction, we approach a universal photon dissipation regime governed by a quantum charge relaxation effect. We observe how photon dissipation is modified when the dot admittance turns from capacitive to inductive. When the fermionic reservoirs are voltage biased, the dot can even cause photon emission due to inelastic tunneling to/from a Bardeen-Cooper-Schrieffer peak in the density of states of the superconducting contact. We can model these numerous effects quantitatively in terms of the charge susceptibility of the quantum dot circuit. This validates an approach that could be used to study a wide class of mesoscopic QED devices.

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Finite Frequency Noise of a Superconductor-Ferromagnet Quantum Point Contact

Cottet¹,

Douçot²,

Belzig³

2008

Phys. Rev. Lett.

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We calculate the finite-frequency current noise of a superconductor-ferromagnet quantum point contact (SF QPC). This signal is qualitatively affected by the spin dependence of interfacial phase shifts acquired by electrons upon reflection on the QPC. For a weakly transparent QPC, noise steps appear at frequencies or voltages determined directly by the spin dependence of interfacial phase shifts. These steps can occur at experimentally accessible temperatures and frequencies. Finite-frequency noise is thus a promising tool to characterize the scattering properties of a SF QPC.

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Photoassisted Andreev reflection as a probe of quantum noise

Cited by 4 publications

References 30 publications

Cavity Photons as a Probe for Charge Relaxation Resistance and Photon Emission in a Quantum Dot Coupled to Normal and Superconducting Continua

Cavity Photons as a Probe for Charge Relaxation Resistance and Photon Emission in a Quantum Dot Coupled to Normal and Superconducting Continua

Cavity photons as a probe for charge relaxation resistance and photon emission in a quantum dot coupled to normal and superconducting continua

Finite Frequency Noise of a Superconductor-Ferromagnet Quantum Point Contact

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