Quantum key distribution on composite photons, polarization qutrits

Kulik, S. P.; Молотков, С. Н.; Radchenko, I. V.

doi:10.1134/s0021364012170080

Cited by 32 publications

(34 citation statements)

References 8 publications

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“…These plots therefore demonstrates that I c R N in these junctions becomes a barrier independent universal constant for a fixed n 1 = n 2 ; the value of this constant depends weakly on n 1 and n 2 . This behavior is in sharp contrast to all JJs made out of topological or conventional superconductors studied earlier 17,18,20,21 .…”

Section: Andreev Bound Statescontrasting

confidence: 76%

Josephson junctions of Weyl and multi-Weyl semimetals

et al. 2020

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We study a Josephson junction involving a Weyl and a multi-Weyl semimetal separated by a barrier region of width d created by putting a gate voltage U0 over the Weyl semimetal. The topological winding number of such a junction changes across the barrier. We show that IcRN for such junctions, where Ic is the critical current and RN the normal state resistance, in the thin barrier limit, has a universal value independent of the barrier potential. We provide an analytical expression of the Andreev bound states and use it to demonstrate that the universal value of IcRN is a consequence of change in topological winding number across the junction. We also study AC Josephson effect in such a junction in the presence of an external microwave radiation, chart out its current-voltage characteristics, and show that the change in the winding number across the junction shapes the properties of its Shapiro steps. We discuss the effect of increasing barrier thickness d on the above-mentioned properties and chart out experiments which may test our theory.

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Section: Andreev Bound Statescontrasting

confidence: 76%

Josephson junctions of Weyl and multi-Weyl semimetals

et al. 2020

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“…However, the observed I c –T dependencies of our results do not fit in every case to these models. Partly, they show behaviours not predicted within the tested models and sometimes far away from standard models like Ambegaokar–Baratoff or Kulik–Omelyanchuk . Since the amount of different models is too large we will not give an introduction to all of them in this section but will discuss the used ones in more detail in the context of the measurement.…”

Section: Electrical Characterisation Of the Junctionsmentioning

confidence: 99%

Josephson effects at iron pnictide superconductors: Approaching phase‐sensitive experiments

Schmidt

Döring

Hasan

et al. 2016

Physica Status Solidi (b)

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The electrical transport in the pnictides especially the quasiparticle tunnelling and Josephson effects in inhomogeneous superconducting systems can provide information on the symmetry of the order parameter. Different kinds of Josephson junctions with one or two pnictide electrodes were realised and their properties were experimentally studied in detail (e.g., current–voltage characteristics, microwave response, current‐phase relations, dependencies on temperature and external magnetic field). These results were compared to well‐known Josephson junctions and recent theories taking into account the special properties (multiband superconductivity, exotic pairing symmetry) of the pnictides. By combination of two junctions in different crystal directions with different barrier transparencies one forms corner junctions or SQUIDs as phase‐sensitive devices. If the technological problems can be solved the investigations on such devices will finally clear up the symmetry of the pnictides, directly. These investigations will lead to a better understanding of fundamental properties of the pnictides as well as to a realistic judgement on the potential for applications of pnictides in superconducting electronics and sensor applications, both established ones and novel ones utilising the special pnictide properties.

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“…In this limit, the oscillatory behavior of Josephson current can be understood as a consequence of transmission resonance phenomenon of DiracBogoliubov-de Gennes (DBdG) quasiparticles in graphene. The Josephson current reaches the Kulik-Omelyanchuk limit 22 for χ = nπ (n being an integer), but, unlike conventional junctions, never reaches the Ambegaokar Baratoff limit 23 for large χ. This analysis is done in Sec.…”

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confidence: 99%

Graphene: Junctions and STM Spectra

Maiti

Saha

Sengupta

2012

Int. J. Mod. Phys. B

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The presence of low-energy Dirac-like quasiparticles is one of the central features responsible for plethora of recent theoretical and experimental studies on graphene. In this review, we focus on the effect of the Dirac nature of these quasiparticles on two separate aspects. The first of these involves transport across superconducting graphene junctions with barriers of thickness d and arbitrary gate voltages V0 applied across the barrier region. The second aspect involves study of the presence of localized magnetic impurities in graphene in which we discuss the unconventional nature of Kondo physics in graphene and the tunablity of Kondo effect with a gate voltage. We also chart out the nature of scanning tunneling conductance spectra for both doped and undoped graphene in the presence of impurities and discuss the effect of Dirac nature of graphene quasiparticles on such spectra. In particular, we provide a detailed analysis of the phenomenon that that the position of the impurity in the graphene matrix plays a crucial role in determining the nature of the STM specta.

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Quantum key distribution on composite photons, polarization qutrits

Cited by 32 publications

References 8 publications

Josephson junctions of Weyl and multi-Weyl semimetals

Josephson junctions of Weyl and multi-Weyl semimetals

Josephson effects at iron pnictide superconductors: Approaching phase‐sensitive experiments

Graphene: Junctions and STM Spectra

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