Coulomb blockade of two-electron tunneling

Hekking, F. W. J.; Glazman, L. I.; Матвеев, К. А.; Shekhter, R. I.

doi:10.1103/physrevlett.70.4138

Cited by 139 publications

(144 citation statements)

References 7 publications

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“…In this case, the system is at the degeneracy point, since the energies of two ground states with an even number of carriers are the same. The current is then finite for any bias [296], and there is no Coulomb blockade behavior: Cooper pair tunneling starts from zero voltage.…”

Section: A Coulomb Blockadementioning

confidence: 99%

Shot noise in mesoscopic conductors

2000

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Theoretical and experimental work concerned with dynamic fluctuations has developed into a very active and fascinating subfield of mesoscopic physics. We present a review of this development focusing on shot noise in small electric conductors. Shot noise is a consequence of the quantization of charge. It can be used to obtain information on a system which is not available through conductance measurements. In particular, shot noise experiments can determine the charge and statistics of the quasiparticles relevant for transport, and reveal information on the potential profile and internal energy scales of mesoscopic systems. Shot noise is generally more sensitive to the effects of electron-electron interactions than the average conductance. We present a discussion based on the conceptually transparent scattering approach and on the classical Langevin and BoltzmannLangevin methods; in addition a discussion of results which cannot be obtained by these methods is provided. We conclude the review by pointing out a number of unsolved problems and an outlook on the likely future development of the field.

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Section: A Coulomb Blockadementioning

confidence: 99%

Shot noise in mesoscopic conductors

2000

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“…The case of a superconducting island connected to two normal electrodes (NSN geometry), was studied recently in Refs. [4,9,10]. Our method to include interference effects can also be applied to this case.…”

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confidence: 99%

“…We first review shortly the two-electron tunneling through a superconducting-normal interface as it has been discussed by Wilkins [2] and more recently by Hekking et al [4].…”

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confidence: 99%

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Subgap conductivity of a superconductor–normal-metal tunnel interface

1994

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FRGAt low temperatures, the transport through a superconducting-normal tunnel interface is due to tunneling of electrons in pairs. The probability for this process is shown to depend on the layout of the electrodes near the tunnel junction, rather than on properties of the tunnel barrier. This dependence is due to interference of the electron waves on a space scale determined by the coherence length, either in the normal or the superconducting metal. The approach developed allows us to evaluate the subgap current for different layouts of interest.

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“…Quasiparticles having a continuous spectrum are inherently present in any superconducting device and set a fundamental constraint on the coherence time. Quasiparticle "poisoning", first investigated in the context of charge-parity effects in mesoscopic superconductors 7,8,9 , manifests itself also in the experiments with charge qubits 11,12,13,14,15 . It was reported that even at low temperatures (∼10-50mK) quasiparticles are present in the CPB.…”

Section: Introductionmentioning

confidence: 99%

Quasiparticle decay rate of Josephson charge qubit oscillations

2005

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We analyze the decay of quantum oscillations in a charge qubit consisting of a Cooper pair box connected by a Josephson junction to a finite-size superconductor. We concentrate on the contribution of quasiparticles in the superconductors to the decay rate. Passing of a quasiparticle through the Josephson junction leads to the escape of the qubit out of its Hilbert space, and thus determines the decay rate of quantum oscillations. We find the temperature dependence of the quasiparticle contribution to the decay rate for open and isolated systems. The former case is realized if a normal-state trap is included in the circuit, or if just one vortex resides in the qubit; we find exponential suppression of the rate, Γ ∝ exp (−∆/T ), at low temperatures (here, ∆ is the superconducting gap). In a superconducting qubit isolated from the environment Γ ∝ exp (−2∆/T ) if the number of electrons is even, while for an odd number of electrons the decay rate remains finite in the limit T → 0. We estimate Γ for realistic parameters of a qubit.

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Coulomb blockade of two-electron tunneling

Cited by 139 publications

References 7 publications

Shot noise in mesoscopic conductors

Shot noise in mesoscopic conductors

Subgap conductivity of a superconductor–normal-metal tunnel interface

Quasiparticle decay rate of Josephson charge qubit oscillations

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