Observation of Vanishing Charge Dispersion of a Nearly Open Superconducting Island

Bargerbos, Arno; Uilhoorn, Willemijn; Yang, Chung Kai; Krogstrup, Peter; Kouwenhoven, Leo P.; Lange, G. de; Heck, Bernard van; Kou, Angela

doi:10.1103/physrevlett.124.246802

Cited by 48 publications

(40 citation statements)

References 54 publications

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“…4(a). The interlaced sinusoidal qubit response as a function of V C (column average subtracted) represents the two charge parity branches, visible in the offset-chargesensitive regime, as investigated previously in conventional [31] and semiconducting junctions [12,13]. The simultaneous visibility of both parity branches indicates parity switching (poisoning) that is fast compared to the measurement time [31].…”

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confidence: 88%

“…Variants of the conventional metallic transmon qubit [1,2] based on a semiconductor nanowires (NWs) with an epitaxial superconducting shell have appeared recently and shown great promise for qubit applications, offering atomically precise interfaces and electrostatic control of junction properties [3][4][5][6][7]. By now, qubit spectroscopy [3], coherence [4], two-qubit operation [5], gatecontrolled qubit coupling [8], and dc monitoring [9] have been demonstrated, along with investigations of applied magnetic field [7], junction Andreev bound states [6,10], anharmonicity [11], charge dispersion [12,13], spin [14], and parity protection [15]. However, axial flux effects from a fully surrounding Al shell on Josephson coupling have not been considered previously.…”

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confidence: 99%

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Destructive Little-Parks Effect in a Full-Shell Nanowire-Based Transmon

et al. 2020

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A semiconductor transmon with an epitaxial Al shell fully surrounding an InAs nanowire core is investigated in the low E J =E C regime. Little-Parks oscillations as a function of flux along the hybrid wire axis are destructive, creating lobes of reentrant superconductivity separated by a metallic state at a half quantum of applied flux. In the first lobe, phase winding around the shell can induce topological superconductivity in the core. Coherent qubit operation is observed in both the zeroth and first lobes. Splitting of parity bands by coherent single-electron coupling across the junction is not resolved beyond line broadening, placing a bound on Majorana coupling, E M =h < 10 MHz, much smaller than the Josephson coupling E J =h ∼ 4.7 GHz.

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confidence: 88%

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confidence: 99%

Destructive Little-Parks Effect in a Full-Shell Nanowire-Based Transmon

et al. 2020

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“…Superconductor-semiconductor-superconductor (S-Sm-S) nanowire Josephson junctions have been integrated into various superconducting circuits, including gate-voltagetunable transmon qubits, known as gatemons [1,2], tunable superconducting resonators [3], and Andreev qubits [4,5]. These hybrid junction elements allow in situ voltage control of their Andreev spectra and current-phase relation [6][7][8][9], in turn influencing measurable qubit properties such as anharmonicity [10] and charge dispersion [11,12]. Moreover, S-Sm nanowires in the presence of strong magnetic fields may host Majorana zero modes-as evidenced by both dc-tunneling and Coulomb-blockade-spectroscopy measurements [13,14]-potentially forming the basis of robust topological qubits [15].…”

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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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“…Panel (b) copied from Ref. [9]. Normalized two-tone spectroscopy measurements of the 0 → 1 transition versus the offset charge.…”

Section: Josephson Junctions Phenomenology and A Model Of A Single-junction Qubitmentioning

confidence: 99%

Bogoliubov quasiparticles in superconducting qubits

Glazman

Catelani

2021

SciPost Phys. Lect. Notes

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Extending the qubit coherence times is a crucial task in building quantum information processing devices. In the three-dimensional cavity implementations of circuit QED, the coherence of superconducting qubits was improved dramatically due to cutting the losses associated with the photon emission. Next frontier in improving the coherence includes the mitigation of the adverse effects of superconducting quasiparticles. In these lectures, we review the basics of the quasiparticles dynamics, their interaction with the qubit degree of freedom, their contribution to the qubit relaxation rates, and approaches to control their effect.

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Observation of Vanishing Charge Dispersion of a Nearly Open Superconducting Island

Cited by 48 publications

References 54 publications

Destructive Little-Parks Effect in a Full-Shell Nanowire-Based Transmon

Destructive Little-Parks Effect in a Full-Shell Nanowire-Based Transmon

Magnetic-Field-Compatible Superconducting Transmon Qubit

Bogoliubov quasiparticles in superconducting qubits

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