Rabi oscillations in a superconducting nanowire circuit

Schön, Yannick; Voss, Jan Nicolas; Wildermuth, Micha; Schneider, Andre; Skacel, Sebastian T.; Weides, Martin; Cole, Jared H.; Rotzinger, Hannes; Ustinov, A. V.

doi:10.1038/s41535-020-0220-x

Cited by 22 publications

(21 citation statements)

References 45 publications

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“…Granular aluminum, similarly to other materials such as NbN [21], NbTiN [22], or TiN [23], is an attractive choice for superconducting hybrid systems operating at radio frequencies, due to its large critical magnetic field [24,25], high coherence in the microwave domain [26][27][28][29], and intrinsic nonlinearity [30,31]. The constituent Al grains, about 3-5 nm in diameter [32], are separated by thin oxygen barriers; therefore, grAl structures can be modeled as arrays of JJs [30].…”

Section: Introductionmentioning

confidence: 99%

Implementation of a Transmon Qubit Using Superconducting Granular Aluminum

et al. 2020

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The high kinetic inductance offered by granular aluminum (grAl) has recently been employed for linear inductors in superconducting high-impedance qubits and kinetic inductance detectors. Because of its large critical current density compared to typical Josephson junctions, its resilience to external magnetic fields, and its low dissipation, grAl may also provide a robust source of nonlinearity for strongly driven quantum circuits, topological superconductivity, and hybrid systems. Having said that, can the grAl nonlinearity be sufficient to build a qubit? Here we show that a small grAl volume (10 × 200 × 500 nm 3) shunted by a thin film aluminum capacitor results in a microwave oscillator with anharmonicity α two orders of magnitude larger than its spectral linewidth Γ 01 , effectively forming a transmon qubit. With increasing drive power, we observe several multiphoton transitions starting from the ground state, from which we extract α ¼ 2π × 4.48 MHz. Resonance fluorescence measurements of the j0i → j1i transition yield an intrinsic qubit linewidth γ ¼ 2π × 10 kHz, corresponding to a lifetime of 16 μs, as confirmed by pulsed time-domain measurements. This linewidth remains below 2π × 150 kHz for in-plane magnetic fields up to ∼70 mT.

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Section: Introductionmentioning

confidence: 99%

Implementation of a Transmon Qubit Using Superconducting Granular Aluminum

et al. 2020

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“…Moreover, the kinetic inductance is nonlinear in both current and temperature. These unique properties of high kinetic inductance nanobridges and nanowires result in their application as scalable key elements in many recently demonstrated device applications ranging from single-photon detectors [4] to qubit readout and qubit architectures [5][6][7][8][9], magnetic memories and sensors [10,11] and superconductor microwave detectors [12,13]. Despite the technical relevance and many applications of high kinetic inductance devices, it is complicated to precisely measure the kinetic inductance value.…”

Section: Introductionmentioning

confidence: 99%

The impact of kinetic inductance on the critical current oscillations of nanobridge SQUIDs

Dausy,

Nulens,

Raes

et al. 2021

Preprint

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In this work, we study the current phase relation (CΦR) of lithographically fabricated molybdenum germanium (MoGe) nanobridges, which is intimately linked to the nanobridge kinetic inductance. We do this by imbedding the nanobridges in a SQUID. We observe that for temperatures far below Tc, the CΦR is linear as long as the condensate is not weakened by the presence of supercurrent. We demonstrate lithographic control over the nanobridge kinetic inductance, which scales with the nanobridge aspect ratio. This allows to tune the SQUID Ic(B) characteristic. The SQUID properties that can be controlled in this way include the SQUID sensitivity and the positions of the critical current maxima. These observations can be of use for the design and operation of future superconducting devices such as magnetic memories or flux qubits.

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“…The main differences with Josephson junctions are observed when AlO x is patterned in the form of a nanowire. The nanoscale structure can be advantageous in terms of electric loss, and in the limit of a short constriction can even be used as a non-linear element for quantum circuit design [8].…”

Section: Introductionmentioning

confidence: 99%

Current-Resistance Effects Inducing Nonlinear Fluctuation Mechanisms in Granular Aluminum Oxide Nanowires

et al. 2020

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The unusual superconducting properties of granular aluminum oxide have been recently investigated for application in quantum circuits. However, the intrinsic irregular structure of this material requires a good understanding of the transport mechanisms and, in particular, the effect of disorder, especially when patterned at the nanoscale level. In view of these aspects, electric transport and voltage fluctuations have been investigated on thin-film based granular aluminum oxide nanowires, in the normal state and at temperatures between 8 and 300 K. The nonlinear resistivity and two-level tunneling fluctuators have been observed. Regarding the nature of the noise processes, the experimental findings give a clear indication in favor of a dynamic random resistor network model, rather than the possible existence of a local ordering of magnetic origin. The identification of the charge carrier fluctuations in the normal state of granular aluminum oxide nanowires is very useful for improving the fabrication process and, therefore, reducing the possible sources of decoherence in the superconducting state, where quantum technologies that are based on these nanostructures should work.

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Rabi oscillations in a superconducting nanowire circuit

Cited by 22 publications

References 45 publications

Implementation of a Transmon Qubit Using Superconducting Granular Aluminum

Implementation of a Transmon Qubit Using Superconducting Granular Aluminum

The impact of kinetic inductance on the critical current oscillations of nanobridge SQUIDs

Current-Resistance Effects Inducing Nonlinear Fluctuation Mechanisms in Granular Aluminum Oxide Nanowires

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