Observation of multiple Andreev reflections in superconducting tunnel junctions

Kleinsasser, A. W.; Miller, Ronald E.; Mallison, W. H.; Arnold, G.

doi:10.1103/physrevlett.72.1738

Cited by 153 publications

(99 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…As the transmission of the channel rises from 0 to 1, the higher order processes grow stronger and the current increases progressively. The ensemble of steps is called "subharmonic gap structure", which was in fact discovered experimentally [26], has been extensively studied in superconducting weak links and tunnel junctions with a very large number of channels [27,28].…”

Section: Transport Through a Superconducting Quantum Point Contactmentioning

confidence: 99%

Conduction channels of superconducting quantum point contacts

Scheer

Cuevas

Yeyati

et al. 2000

Physica B: Condensed Matter

View full text Add to dashboard Cite

Esta es la versión de autor del artículo publicado en: This is an author produced version of a paper published in: El acceso a la versión del editor puede requerir la suscripción del recurso Access to the published version may require subscription Atomic quantum point contacts accommodate a small number of conduction channels. Their number N and transmission coefficients {Tn} can be determined by analyzing the subgap structure due to multiple Andreev reflections in the current-voltage (IV ) characteristics in the superconducting state.With the help of mechanically controllable break-junctions we have produced Al contacts consisting of a small number of atoms. In the smallest stable contacts, usually three channels contribute to the transport. We show here that the channel ensemble {Tn} of few atom contacts remains unchanged up to temperatures and magnetic fields approaching the critical temperature and the critical field, respectively, giving experimental evidence for the prediction that the conduction channels are the same in the normal and in the superconducting state.

show abstract

Section: Transport Through a Superconducting Quantum Point Contactmentioning

confidence: 99%

Conduction channels of superconducting quantum point contacts

Scheer

Cuevas

Yeyati

et al. 2000

Physica B: Condensed Matter

View full text Add to dashboard Cite

show abstract

“…By exploring leakage current of such systems, we observed that a tunnel junction may contain much fewer pinholes than previously speculated [24]. We further demonstrated how highly sensitive current measurements can clarify the existence of pinholes.…”

Section: Discussionmentioning

confidence: 68%

“…In Ref. [24] the subharmonic gap structure of a tunnel junction was modeled by assuming that some channels have pinhole character. Analyzing superconducting qubits containing pinholes has additional motivations that are going to be reviewed in the following subsections.…”

Section: B Rough Superconducting Tunnel Junctionsmentioning

confidence: 99%

Current fluctuations in rough superconducting tunnel junctions

Heinrich

Wilhelm

2009

Phys. Rev. B

View full text Add to dashboard Cite

Intrinsic noise is known to be ubiquitous in Josephson junctions. We investigate a voltage biased superconducting tunnel junction including a very small number of pinholes -transport channels possessing a transmission coefficient close to unity. Although few of these pinholes contribute very little to the conductance, they can dominate current fluctuations in the low-voltage regime. We show that even fully transparent transport channels between superconductors contribute to shot noise due to the uncertainty in the number of Andreev cycles. We discuss shot noise enhancement by Multiple Andreev Reflection in such a junction and investigate whether pinholes might contribute as a microscopic mechanism of two-level current fluctuators. We discuss the connection of these results to the junction resonators observed in Josephson phase qubits.

show abstract

“…With this area, the cited E J value corresponds to the critical current density j c about 10 µA/µm 2 , and the total critical current I c = 2eE J /h ≃ 50 nA. Experimentally, this value of j c is within the range of current densities that can be achieved without the degradation of the tunnel junction quality [29].…”

mentioning

confidence: 75%

Adiabatic quantum computation with Cooper pairs

Averin

1998

Solid State Communications

288

256

View full text Add to dashboard Cite

We propose a new variant of the controlled-NOT quantum logic gate based on adiabatic level-crossing dynamics of the q-bits. The gate has a natural imple- Practical realization of a quantum computer requires, however, very precise and reversible time evolution of complex quantum mechanical systems, the fact that gives rise to serious doubts [4] as to whether even the simplest version of a quantum computer will ever become a reality. It is therefore important to look into various possible ways of implementing simple elements of quantum computer -quantum logic gates in order to find the optimal approach to building such a computer. Generally speaking, a quantum gate should satisfy two contradictory requirements: being isolated from the outside world in order to maintain 1

show abstract

Observation of multiple Andreev reflections in superconducting tunnel junctions

Cited by 153 publications

References 22 publications

Conduction channels of superconducting quantum point contacts

Conduction channels of superconducting quantum point contacts

Current fluctuations in rough superconducting tunnel junctions

Adiabatic quantum computation with Cooper pairs

Contact Info

Product

Resources

About