Circuit-quantum electrodynamics with direct magnetic coupling to single-atom spin qubits in isotopically enriched 28Si

Tosi, Guilherme; Mohiyaddin, Fahd A.; Huebl, Hans; Morello, Andrea

doi:10.1063/1.4893242

Cited by 37 publications

(40 citation statements)

References 52 publications

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“…59 We note that, while the qubit-resonator coupling strength g is limited by the constraint ξ 1 required for the validity of the Heisenberg model description of the RX qubit, 18 the estimate we obtain here does not represent a fundamental limit and varies strongly with the chosen parameters. Further enhancements of g may be possible by, e.g., modifying the design of the transmission line resonator to increase the strength of the electric field within the region containing the RX qubit 60,70 and thus the chargecavity coupling strength g 0 . Recent work 70 demonstrates a characteristic impedance Z 0 ≈ 4 kΩ for superconducting nanowire resonators with high kinetic inductance, which leads to g 0 ≈ 2π × 120 MHz and g ≈ 2π × 9 MHz for the same values of ω 0 , v and ξ chosen above.…”

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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“…However, in this case, the anharmonicity which is inherent to a two level system is lost so that the spin ensemble can only be used as a quantum memory. To remain at the single spin level, it has been suggested to include in the microwave cavity a nanometric constriction to concentrate the cavity field, which would yield g m ∼ 10 kHz 110,111 . Alternatively, various theory Refs.…”

Section: Spin-photon Coupling Due To Spin-orbit Couplingmentioning

confidence: 99%

Cavity QED with hybrid nanocircuits: from atomic-like physics to condensed matter phenomena

Cottet¹,

Dartiailh²,

Desjardins³

et al. 2017

J. Phys.: Condens. Matter

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Circuit QED techniques have been instrumental to manipulate and probe with exquisite sensitivity the quantum state of superconducting quantum bits coupled to microwave cavities. Recently, it has become possible to fabricate new devices where the superconducting quantum bits are replaced by hybrid mesoscopic circuits combining nanoconductors and metallic reservoirs. This mesoscopic QED provides a new experimental playground to study the light-matter interaction in electronic circuits. Here, we present the experimental state of the art of Mesoscopic QED and its theoretical description. A first class of experiments focuses on the artificial atom limit, where some quasiparticles are trapped in nanocircuit bound states. In this limit, the Circuit QED techniques can be used to manipulate and probe electronic degrees of freedom such as confined charges, spins, or Andreev pairs. A second class of experiments consists in using cavity photons to reveal the dynamics of electron tunneling between a nanoconductor and fermionic reservoirs. For instance, the Kondo effect, the charge relaxation caused by grounded metallic contacts, and the photo-emission caused by voltage-biased reservoirs have been studied. The tunnel coupling between nanoconductors and fermionic reservoirs also enable one to obtain split Cooper pairs, or Majorana bound states. Cavity photons represent a qualitatively new tool to study these exotic condensed matter states.

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“…The electrons are confined in a 2DEG at a distance d from a current-carrying wire, which is located above the surface. For our purposes, SC circuits and circuit resonators are attractive because of their capability to generate AC magnetic fields by carry-ing relatively large currents and the possibility to integrate them in semiconductor nanostructures [42,43]. In a simple toy model, we describe the circuit by a meandering wire carrying an AC current ∼ I 0 cos(ωt) through parallel sections of the wire separated by a lattice constant a, see Fig.…”

Section: A Superconducting Circuitmentioning

confidence: 99%

Solid-state magnetic traps and lattices

et al. 2018

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We propose and analyze magnetic traps and lattices for electrons in semiconductors. We provide a general theoretical framework and show that thermally stable traps can be generated by magnetically driving the particle's internal spin transition, akin to optical dipole traps for ultra-cold atoms. Next we discuss in detail periodic arrays of magnetic traps, i.e. magnetic lattices, as a platform for quantum simulation of exotic Hubbard models, with lattice parameters that can be tuned in real time. Our scheme can be readily implemented in state-of-the-art experiments, as we particularize for two specific setups, one based on a superconducting circuit and another one based on surface acoustic waves.

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Circuit-quantum electrodynamics with direct magnetic coupling to single-atom spin qubits in isotopically enriched 28Si

Cited by 37 publications

References 52 publications

Entangling distant resonant exchange qubits via circuit quantum electrodynamics

Entangling distant resonant exchange qubits via circuit quantum electrodynamics

Cavity QED with hybrid nanocircuits: from atomic-like physics to condensed matter phenomena

Solid-state magnetic traps and lattices

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