High-Kinetic-Inductance Superconducting Nanowire Resonators for Circuit QED in a Magnetic Field

Samkharadze, Nodar; Bruno, Alessandro; Scarlino, Pasquale; Zheng, Guoji; DiVincenzo, David P.; DiCarlo, L.; Vandersypen, L. M. K.

doi:10.1103/physrevapplied.5.044004

Cited by 271 publications

(269 citation statements)

References 35 publications

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“…Here, (n 1 , n 2 , n 3 ) denotes the charge occupation of each dot (numbered from left to right). We assume that a uniform external magnetic field is applied in the plane of the device 16 in order to minimize its effect on the superconducting state of the resonator 70 and is sufficiently large (typically 100 mT 17 ) such that other three-electron states are energetically distant from the subspace we consider. 18 For RX qubits implemented Figure 1.…”

Section: Dipole Coupling Of a Resonant Exchange Qubit To A Transmmentioning

confidence: 99%

Entangling distant resonant exchange qubits via circuit quantum electrodynamics

2016

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We investigate a hybrid quantum system consisting of spatially separated resonant exchange qubits, defined in three-electron semiconductor triple quantum dots, that are coupled via a superconducting transmission line resonator. Drawing on methods from circuit quantum electrodynamics and Hartmann-Hahn double resonance techniques, we analyze three specific approaches for implementing resonator-mediated two-qubit entangling gates in both dispersive and resonant regimes of interaction. We calculate entangling gate fidelities as well as the rate of relaxation via phonons for resonant exchange qubits in silicon triple dots and show that such an implementation is particularly well-suited to achieving the strong coupling regime. Our approach combines the favorable coherence properties of encoded spin qubits in silicon with the rapid and robust long-range entanglement provided by circuit QED systems.

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Section: Dipole Coupling Of a Resonant Exchange Qubit To A Transmmentioning

confidence: 99%

Entangling distant resonant exchange qubits via circuit quantum electrodynamics

2016

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“…36. The recent progress in engineering sensitive superconducting cavities makes it possible to implement on-chip mesoscopic circuits coupled to high finesse resonators 37 .…”

Section: Introductionmentioning

confidence: 99%

Josephson effect in topological superconducting rings coupled to a microwave cavity

2016

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We theoretically study a one dimensional p-wave superconducting mesoscopic ring interrupted by a weak link and coupled inductively to a microwave cavity. We establish an input-output description for the cavity field in the presence of the ring, and identify the electronic contributions to the cavity response and their dependence on various parameters, such as the magnetic flux, chemical potential, and cavity frequency. We show that the cavity response is 4π periodic as a function of the magnetic flux in the topological region, stemming from the so called fractional Josephson current carried by the Majorana fermions, while it is 2π periodic in the non-topological phase, consistent with the normal Josephson effect. We find a strong dependence of the signal on the cavity frequency, as well as on the parity of the ground state. Our model takes into account fully the interplay between the low-energy Majorana modes and the gaped bulks states, which we show is crucial for visualizing the evolution of the Josephson effect during the transition from the topological to the trivial phase.

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“…Moving to a λ/4 resonator makes the current architecture sufficient in terms of resonator impedance. The impedance could be further increased using a high kinetic inductance based resonator [42] or by using an array of Josephson junctions [43].…”

Section: Towards Higher Coupling In Transmon Systems: a Proposalmentioning

confidence: 99%

Approaching ultrastrong coupling in transmon circuit QED using a high-impedance resonator

et al. 2017

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In this experiment, we couple a superconducting transmon qubit to a high-impedance 645 microwave resonator. Doing so leads to a large qubit-resonator coupling rate g, measured through a large vacuum Rabi splitting of 2g 910 MHz. The coupling is a significant fraction of the qubit and resonator oscillation frequencies ω, placing our system close to the ultrastrong coupling regime (ḡ = g/ω = 0.071 on resonance). Combining this setup with a vacuum-gap transmon architecture shows the potential of reaching deep into the ultrastrong couplingḡ ∼ 0.45 with transmon qubits.

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High-Kinetic-Inductance Superconducting Nanowire Resonators for Circuit QED in a Magnetic Field

Cited by 271 publications

References 35 publications

Entangling distant resonant exchange qubits via circuit quantum electrodynamics

Entangling distant resonant exchange qubits via circuit quantum electrodynamics

Josephson effect in topological superconducting rings coupled to a microwave cavity

Approaching ultrastrong coupling in transmon circuit QED using a high-impedance resonator

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