Electronically tunable quantum phase slips in voltage-biased superconducting rings as a base for phase-slip flux qubits

Kenawy, Ahmed; Magnus, Wim; Miloševıć, M. V.; Sorée, Bart

doi:10.1088/1361-6668/abb8eb

Cited by 8 publications

(6 citation statements)

References 45 publications

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“…Coherent phase slips 183 are the dual of Cooper pairs tunneling. When a phase-slip element, such as a very thin, narrow, and long wire is placed in a loop and magnetically biased at 1/2 flux quantum, degenerate, opposite circulating current states can be stabilized [184][185][186] (Fig. 8b).…”

Section: [H1] Emerging Josephson Devicesmentioning

confidence: 99%

Engineering high-coherence superconducting qubits

Siddiqi

2021

Nat Rev Mater

168

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Advances in materials science and engineering have played a central role in the development of classical computers, and will undoubtedly be critical in propelling the maturation of quantum information technologies. In approaches to quantum computation based on superconducting circuits, as one goes from bulk materials to functional devices, amorphous insulating films and nonequilibrium excitations-electronic and phononic-are introduced, leading to dissipation and fluctuations that limit the computational power of state-of-the-art qubits and processors. In this Review, the major sources of decoherence in superconducting qubits are identified through an exploration of seminal qubit and resonator experiments. The proposed microscopic mechanisms associated with these imperfections are summarized, and directions for future research are discussed. The trade-offs between simple qubit primitives based on a single Josephson tunnel junction and more complex designs that use additional circuit elements, or new junction modalities, to reduce sensitivity to local noise sources are discussed, particularly in the context of materials optimization strategies for each architecture.

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Section: [H1] Emerging Josephson Devicesmentioning

confidence: 99%

Engineering high-coherence superconducting qubits

Siddiqi

2021

Nat Rev Mater

168

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“…In the present study, the ξ for the device is about 9-10 nm (figure S2 in supplementary information (SI)) whereas, the thickness and the width of the meander are 50 and 200 nm, respectively. However, 1D model was extended to quasi 1D macroscopic crystals [19,31,32], 2D superconducting strips [12,33], wide percolating films [34], nano-constrictions [35][36][37] nanowire network [38,39] etc. Further, for FIB fabricated nanowires, due to Ga deposition and possible oxidation from the sidewall, the effective width becomes much smaller than the measured width [28,29,40].…”

Section: Resultsmentioning

confidence: 99%

Accessing phase slip events in Nb meander wires

Sawle¹,

Husale²,

Yadav³

et al. 2021

Supercond. Sci. Technol.

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We report transport studies through Nb-based superconducting meander wires fabricated by focused ion beam milling technique. The effect of meandering on quantum transport has been probed experimentally by a direct comparison with the pristine thin-film device before meandering. The normal metal (NM) to superconductor (SC) phase transition becomes a wide and multi-step transition by meandering. Below the transition temperature (T c), the resistance-versus-temperature measurements reveal resistive tailing which is explained by the thermally activated phase slip (TAPS) mechanism. The TAPS fit indicates a selective region of the meander to be responsible for the resistive tailing. Besides, the phase slip (PS) mechanism in the meander is evident in its current–voltage characteristics that feature the stair-case type intermediate resistive steps (IRSs) during the SC–NM transition. The modulation of the IRSs is investigated with respect to temperature and external magnetic field. It is observed that the PS events are facilitated by magnetic fields up to about 250 mT. Further, the critical current varies strongly on the temperature and magnetic field for T < 0.5 T c and H ⩽ 100 mT where it fluctuates in an oscillatory manner. Finally, Nb based meander structures can be promising candidates for future PS based studies and applications.

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“…The growth of investigations on quantized excitations in superconducting mesoscopic systems is persistent, [ 13–16 ] either in shape of simple rings [ 17 ] or in combination with semiconducting nanostructures as building blocks for “robust” quantum bits. [ 18–20 ]…”

Section: Introductionmentioning

confidence: 99%

“…The growth of investigations on quantized excitations in superconducting mesoscopic systems is persistent, [13][14][15][16] either in shape of simple rings [17] or in combination with semiconducting nanostructures as building blocks for "robust" quantum bits. [18][19][20] However, though MROs [21][22][23][24][25][26][27][28][29][30][31][32][33] are recognized as quantum interference effects, the argument deserves further investigations, especially from the phenomenological point of view.…”

Section: Introductionmentioning

confidence: 99%

Quantum Interference by Vortex Supercurrents

Papari

Fomin

2023

Physica Rapid Research Ltrs

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The origin of the parabolic background of magnetoresistance oscillations measured in finite‐width superconducting mesoscopic rings with input and output stubs and in patterned films is analyzed. The transmission model explaining the sinusoidal oscillation of magnetoresistance is extended to address the parabolic background as a function of the magnetic field. Apart from the interference mechanism activated by the ring, pinned superconducting vortices as topological defects introduce a further interference‐based distribution of supercurrents that affects, in turn, the voltmeter‐sensed quasiparticles. The onset of vortices changes the topology of the superconducting state in a mesoscopic ring in such a way that the full magnetoresistance dynamics can be interpreted due to the interference of the constituents of the order parameter induced by both the ring with its doubly connected topology and the vortex lattice in it.

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Electronically tunable quantum phase slips in voltage-biased superconducting rings as a base for phase-slip flux qubits

Cited by 8 publications

References 45 publications

Engineering high-coherence superconducting qubits

Engineering high-coherence superconducting qubits

Accessing phase slip events in Nb meander wires

Quantum Interference by Vortex Supercurrents

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