Coherent quantum phase slip

Astafiev, O.; Ioffe, L. B.; Kafanov, Sergey; Pashkin, Yu. A.; Arutyunov, K. Yu.; Shahar, D.; Cohen, Ori; Tsai, Jaw Shen

doi:10.1038/nature10930

Cited by 265 publications

(314 citation statements)

References 33 publications

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“…An apparent observation of a coherent phase slip in a conducting weak link 19 may be viewed as an incipient experimental step in that direction. That makes the question about the intrinsic mechanisms of decoherence in weak links important.…”

Section: Pacs Numbersmentioning

confidence: 99%

Frequency-dependent admittance of a short superconducting weak link

2013

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We consider the linear and non-linear electromagnetic responses of a nanowire connecting two bulk superconductors. Andreev states appearing at a finite phase bias substantially affect the finite-frequency admittance of such a wire junction. Electron transitions involving Andreev levels are easily saturated, leading to the nonlinear effects in photon absorption for the sub-gap photon energies. We evaluate the complex admittance analytically at arbitrary frequency and arbitrary, possibly non-equilibrium, occupation of Andreev levels. Special care is given to the limits of a single-channel contact and a disordered metallic weak link. We also evaluate the quasi-static fluctuations of admittance induced by fluctuations of the occupation factors of Andreev levels. In view of possible qubit applications, we compare properties of a weak link with those of a tunnel Josephson junction. Compared to the latter, a weak link has smaller low-frequency dissipation. However, because of the deeper Andreev levels, the low-temperature quasi-static fluctuations of the inductance of a weak link are exponentially larger than of a tunnel junction. These fluctuations limit the applicability of nanowire junctions in superconducting qubits

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Section: Pacs Numbersmentioning

confidence: 99%

Frequency-dependent admittance of a short superconducting weak link

2013

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“…Hence, it is quite realistic to fabricate and study quasi-one dimensional (1D) superconducting systems [1]. It has been demonstrated that in such objects quantum fluctuations of the phase of the complex order parameter e i can suppress zero resistivity at temperatures well below the critical point T<<T c [2][3][4][5][6][7] and dramatically modify the current-phase relation and the magnitude of persistent currents in narrow superconducting nanorings [8,9].…”

Section: Introductionmentioning

confidence: 99%

The Quantum Phase Slip Phenomenon in Superconducting Nanowires with High-Impedance Environment

Arutyunov

Lehtinen

Rantala

2015

J Supercond Nov Magn

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“…2,13 Ultranarrow nanowires have been developed in both these materials with effective diameters in the range 20-40 nm. [14][15][16] QPS in InO x has been demonstrated via spectroscopic measurements of E S in a QPS qubit, 2 while alternative evidence for QPS (in fact, for the dual effect of coherent tunneling of single Cooper pairs) has been observed in NbSi nanowires via quantum interference in a device dual to the SQUID consisting of two QPSJs joined by a superconducting island. 15 Preliminary signs of QPS 17,18 and of dual Shapiro steps 19 have been observed in a Ti nanowire, but only traces of steps are observed.…”

Section: Introductionmentioning

confidence: 99%

NbSi nanowire quantum phase-slip circuits: dc supercurrent blockade, microwave measurements, and thermal analysis

et al. 2013

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We present a detailed report of microwave irradiation of ultranarrow superconducting nanowires. In our nanofabricated circuits containing a superconducting NbSi nanowire, a dc blockade of current flow was observed at low temperatures below a critical voltage V c , a strong indicator of the existence of quantum phase-slip (QPS) in the nanowire. We describe the results of applying microwaves to these samples, using a range of frequencies and both continuous-wave and pulsed drive, in order to search for dual Shapiro steps which would constitute an unambiguous demonstration of quantum phase-slip. We observed no steps, and our subsequent thermal analysis suggests that the electron temperature in the series CrO resistors was significantly elevated above the substrate temperature, resulting in sufficient Johnson noise to wash out the steps. To understand the system and inform future work, we have constructed a numerical model of the dynamics of the circuit for dc and ac bias (both continuous-wave and pulsed drive signals) in the presence of Johnson noise. Using this model, we outline important design considerations for device and measurement parameters which should be used in any future experiment to enable the observation of dual Shapiro steps at experimentally accessible temperatures and, thus, lead to the development of a QPS-based quantum current standard.

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Coherent quantum phase slip

Cited by 265 publications

References 33 publications

Frequency-dependent admittance of a short superconducting weak link

Frequency-dependent admittance of a short superconducting weak link

The Quantum Phase Slip Phenomenon in Superconducting Nanowires with High-Impedance Environment

NbSi nanowire quantum phase-slip circuits: dc supercurrent blockade, microwave measurements, and thermal analysis

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