Spin-orbit qubit on a multiferroic insulator in a superconducting resonator

Zhang, P.; Xiang, Ze-Liang; Nori, Franco

doi:10.1103/physrevb.89.115417

Cited by 11 publications

(10 citation statements)

References 45 publications

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“…2,[22][23][24] One attractive possibility would be to construct Majorana qubits based on MBS. 22 Majorana qubits, among various qubit candidates, [25][26][27][28][29][30][31] are supposed to be robust against local perturbations and hence promising to store quantum information. 13,22,32 Moreover, arbitrary qubit rotations are expected to be implemented, by means of topologically-protected braiding operations 23,33 in combination with other nontopological operations assisted by, e.g., nanomechanical resonators.…”

Section: Introductionmentioning

confidence: 99%

Majorana bound states in a disordered quantum dot chain

Zhang

Nori

2016

New J. Phys.

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We study Majorana bound states in a disordered chain of semiconductor quantum dots proximitycoupled to an s-wave superconductor. By calculating its topological quantum number, based on the scattering-matrix method and a tight-binding model, we can identify the topological property of such an inhomogeneous one-dimensional system. We study the robustness of Majorana bound states against disorder in both the spin-independent terms (including the chemical potential and the regular spin-conserving hopping) and the spin-dependent term, i.e., the spin-flip hopping due to the Rashba spin-orbit coupling. We find that the Majorana bound states are not completely immune to the spinindependent disorder, especially when the latter is strong. Meanwhile, the Majorana bound states are relatively robust against spin-dependent disorder, as long as the spin-flip hopping is of uniform sign (i.e., the varying spin-flip hopping term does not change its sign along the chain). Nevertheless, when the disorder induces sign-flip in spin-flip hopping, the topological-nontopological phase transition takes place in the low-chemical-potential region.

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Section: Introductionmentioning

confidence: 99%

Majorana bound states in a disordered quantum dot chain

Zhang

Nori

2016

New J. Phys.

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“…A growing interest is emerging for exploring new hybrid quantum architectures that could find applications in implementing quantum technologies. Prominent examples include superconducting waveguide cavities or mechanical resonators coupled to cold atoms [2][3][4][5][6][7], polar molecules [8][9][10], quantum dots [11][12][13][14][15], as well as other solid-state spin systems .…”

Section: Introductionmentioning

confidence: 99%

Hybrid Quantum Device Based onNVCenters in Diamond Nanomechanical Resonators Plus Superconducting Waveguide Cavities

Liu

Gao

et al. 2015

Phys. Rev. Applied

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We propose and analyze a hybrid device by integrating a microscale diamond beam with a single built-in nitrogen-vacancy (NV) center spin to a superconducting coplanar waveguide (CPW) cavity. We find that under an ac electric field the quantized motion of the diamond beam can strongly couple to the single cavity photons via dielectric interaction. Together with the strong spin-motion interaction via a large magnetic field gradient, it provides a hybrid quantum device where the diamond resonator can strongly couple both to the single microwave cavity photons and to the single NV center spin. This enables coherent information transfer and effective coupling between the NV spin and the CPW cavity via mechanically dark polaritons. This hybrid spin-electromechanical device, with tunable couplings by external fields, offers a realistic platform for implementing quantum information with single NV spins, diamond mechanical resonators, and single microwave photons.

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“…Furthermore, Majorana qubits could be rotated by topologically-protected braiding operations. 19,29 Therefore, among various realizations of qubits, [30][31][32][33][34][35][36] Majorana qubits are considered to be promising candidates for building blocks of quantum information processors. The braiding operations alone are insufficient to realize a universal quantum gate based on a Majorana qubit.…”

Section: Introductionmentioning

confidence: 99%

Coherent manipulation of a Majorana qubit by a mechanical resonator

Zhang

Nori

2015

Phys. Rev. B

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We propose a hybrid system composed of a Majorana qubit and a nanomechanical resonator, implemented by a spin-orbit-coupled superconducting nanowire, using a set of static and oscillating ferromagnetic gates. The ferromagnetic gates induce Majorana bound states in the nanowire, which hybridize and constitute a Majorana qubit. Due to the oscillation of one of these gates, the Majorana qubit can be coherently rotated. By tuning the gate voltage to modulate the local spin-orbit coupling, it is possible to reach the resonance of the qubit-oscillator system for relatively strong couplings.

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Spin-orbit qubit on a multiferroic insulator in a superconducting resonator

Cited by 11 publications

References 45 publications

Majorana bound states in a disordered quantum dot chain

Majorana bound states in a disordered quantum dot chain

Hybrid Quantum Device Based onNVCenters in Diamond Nanomechanical Resonators Plus Superconducting Waveguide Cavities

Coherent manipulation of a Majorana qubit by a mechanical resonator

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