Gate-Tunable Field-Compatible Fluxonium

Pita-Vidal, Marta; Bargerbos, Arno; Yang, Chung-Kai; Woerkom, David J. van; Pfaff, Wolfgang; Haider, Nadia; Krogstrup, Peter; Kouwenhoven, Leo P.; Lange, G. de; Kou, Angela

doi:10.1103/physrevapplied.14.064038

Cited by 49 publications

(35 citation statements)

References 55 publications

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“…Recent work has demonstrated the coherent operation of gatemons with S-Sm-S nanowire junctions at moderate magnetic fields of approximately 100 mT [16][17][18]. Spectroscopy of S-Sm-S nanowire fluxonium qubits [19] and graphene-based gatemons [20] at high magnetic fields (approximately 1 T) has also been shown. However, the detailed spectrum and the time-domain coherence properties of gatemons at large magnetic fields remain unexplored.…”

Section: Introductionmentioning

confidence: 99%

Magnetic-Field-Compatible Superconducting Transmon Qubit

et al. 2021

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We present a hybrid semiconductor-based superconducting qubit device that remains coherent at magnetic fields up to 1 T. The qubit transition frequency exhibits periodic oscillations with the magnetic field, consistent with interference effects due to the magnetic flux threading the cross section of the proximitized semiconductor nanowire junction. As the induced superconductivity revives, additional coherent modes emerge at high magnetic fields, which we attribute to the interaction of the qubit and low-energy Andreev states.

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Section: Introductionmentioning

confidence: 99%

Magnetic-Field-Compatible Superconducting Transmon Qubit

et al. 2021

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“…To date, magnetic field studies of QP dynamics in Josephson junction (JJ) circuits consist only of time-averaged experiments performed be-low B < 0.3 T. These works demonstrated the increase in QPP due to field induced Cooper pair breaking [6,20]. Recent developments in magnetic field compatible superconducting resonators [21] and advances in semiconducting NW-based JJs enabled novel semiconductor-based superconducting circuits [22][23][24], that operate in magnetic fields up to 1 T [25,26]. Such devices enable the investigation of QPP in the unexplored magnetic field parameter space that is essential in topological quantum computing, where a magnetic field as strong as 1 T may be required [19].…”

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confidence: 99%

Quasiparticle trapping by orbital effect in a hybrid superconducting-semiconducting circuit

Uilhoorn,

Kroll,

Bargerbos

et al. 2021

Preprint

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The tunneling of quasiparticles (QPs) across Josephson junctions (JJs) detrimentally affects the coherence of superconducting and charge-parity qubits, and is shown to occur more frequently in magnetic fields. Here we demonstrate the parity lifetime to survive in excess of 50 µs in magnetic fields up to 1 T, utilising a semiconducting nanowire transmon to detect QP tunneling in real time. We exploit gate-tunable QP filters and find magnetic-field-enhanced parity lifetimes, consistent with increased QP trapping by the ungated nanowire due to orbital effects. Our findings highlight the importance of QP trap engineering for building magnetic-field compatible hybrid superconducting circuits.

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“…Owing to the low energy dissipation, resilience to magnetic fields, and process compatibility, these emerging materials are advantageous for high-coherence applications and large-scale circuit integration [17][18][19][20][21]. Nevertheless, due to the relatively small kinetic inductance (i.e., on the order of picohenry-per-square), a nanowire with large aspect ratio is inevitably required for the implementation of highinductance elements [22][23][24][25][26]. Any imperfection of the nanowire could be a source of energy dissipation and deteriorate the circuit coherence.…”

Section: Introductionmentioning

confidence: 99%

“…Any imperfection of the nanowire could be a source of energy dissipation and deteriorate the circuit coherence. As a result, tremendous research efforts have been made in the geometric control and optimization of these materials for the practical applications [17,[25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Ultrahigh-inductance materials from spinodal decomposition

Gao,

Ku,

Deng

et al. 2021

Preprint

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Disordered superconducting nitrides with kinetic inductance have long been considered a leading material candidate for high-inductance quantum-circuit applications. Despite continuing efforts in reducing material dimensions to increase the kinetic inductance and the corresponding circuit impedance, it becomes a fundamental challenge to improve further without compromising material qualities. To this end, we propose a method to drastically increase the kinetic inductance of superconducting materials via spinodal decomposition while keeping a low microwave loss. We use epitaxial Ti0.48Al0.52N as a model system, and for the first time demonstrate the utilization of spinodal decomposition to trigger the insulator-to-superconductor transition with a drastically enhanced material disorder. The measured kinetic inductance has increased by 2-3 orders of magnitude compared with all the best reported disordered superconducting nitrides. Our work paves the way for substantially enhancing and deterministically controlling the inductance for advanced superconducting quantum circuits.

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Gate-Tunable Field-Compatible Fluxonium

Cited by 49 publications

References 55 publications

Magnetic-Field-Compatible Superconducting Transmon Qubit

Magnetic-Field-Compatible Superconducting Transmon Qubit

Quasiparticle trapping by orbital effect in a hybrid superconducting-semiconducting circuit

Ultrahigh-inductance materials from spinodal decomposition

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