Resonant microwave-mediated interactions between distant electron spins

Borjans, Felix; Croot, Xanthe; Mi, Xiao; Gullans, Michael; Petta, J. R.

doi:10.1038/s41586-019-1867-y

Cited by 213 publications

(191 citation statements)

References 38 publications

(66 reference statements)

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“…7). For instance, using a higher capacitance split-slit gate design [14,44] for cavity coupling would increase the values of g calculated here by about a factor of 2. Similarly, cavities using high kinetic inductance superconductors and narrow geometries can boost the impedance into the kΩ range, increasing the photon voltage [45]; this would raise g by another factor of 4 or more compared to a baseline 50 Ω resonator, since the coupling scales as √ Z 0 .…”

Section: Projecting Entanglement Protocol Performance In Xrxmentioning

confidence: 86%

“…In a weak spin-orbit material like silicon, a simple way to engineer such an interaction is to use magnetic field gradients [9,10,11], for instance from an on-chip micromagnet. This method has been used to demonstrate spin-photon strong coupling [12,13] and cavity-mediated spin-spin interactions [14] in silicon double-quantum-dots (DQDs). However, field gradients are undesirable for DFS TQDs since they induce qubit leakage [5].…”

Section: Introductionmentioning

confidence: 99%

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Resonant exchange operation in triple-quantum-dot qubits for spin–photon transduction

Pan

Keating²,

Gyure³

et al. 2020

Quantum Sci. Technol.

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Triple quantum dots (TQDs) are promising semiconductor spin qubits because of their all-electrical control via fast, tunable exchange interactions and immunity to global magnetic fluctuations. These qubits couple to photons in the resonant exchange (RX) regime, when exchange is simultaneously active on both qubit axes. However, most theoretical work has been based on phenomenological Fermi-Hubbard models, which may not fully capture the complexity of the qubit spin-charge states in this regime. Here we investigate exchange in Si/SiGe and GaAs TQDs using full configuration interaction (FCI) calculations which better describe practical device operation. We show that high exchange operation in general, and the RX regime in particular, can differ significantly from simple models, presenting new challenges and opportunities for spin-photon coupling. We highlight the impact of device electrostatics and effective mass on exchange and identify a new operating point (XRX) where strong spin-photon coupling is most likely to occur in Si/SiGe TQDs. Based on our numerical results, we analyze the feasibility of a remote entanglement cavity iSWAP protocol and discuss design pathways for improving fidelity. Our analysis provides insight into the requirements for TQD spin-photon transduction and demonstrates more generally the necessity of accurate modeling of exchange in spin qubits. ‡ Present address:

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Section: Projecting Entanglement Protocol Performance In Xrxmentioning

confidence: 86%

Section: Introductionmentioning

confidence: 99%

Resonant exchange operation in triple-quantum-dot qubits for spin–photon transduction

Pan

Keating²,

Gyure³

et al. 2020

Quantum Sci. Technol.

View full text Add to dashboard Cite

show abstract

“…The micromagnet could be designed to induce a longitudinal magnetic field gradient between the left and the right QDs with the aim of obtaining a different spin resonance frequency depending on the electron position. Fabrication misalignments can also give rise to both longitudinal gradients and overall transverse magnetic fields [16,50,60], i.e., the magnetic field components in the right and left QD positions may be B…”

Section: Flopping-mode Charge Noise Sweet Spotsmentioning

confidence: 99%

Electric-field control and noise protection of the flopping-mode spin qubit

et al. 2019

Self Cite

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We propose and analyze a novel "flopping-mode" mechanism for electric dipole spin resonance based on the delocalization of a single electron across a double quantum dot confinement potential. Delocalization of the charge maximizes the electronic dipole moment compared to the conventional single dot spin resonance configuration. We present a theoretical investigation of the floppingmode spin qubit properties through the crossover from the double to the single dot configuration by calculating effective spin Rabi frequencies and single-qubit gate fidelities. The flopping-mode regime optimizes the artificial spin-orbit effect generated by an external micromagnet and draws on the existence of an externally controllable sweet spot, where the coupling of the qubit to charge noise is highly suppressed. We further analyze the sweet spot behavior in the presence of a longitudinal magnetic field gradient, which gives rise to a second order sweet spot with reduced sensitivity to charge fluctuations. arXiv:1904.13117v2 [cond-mat.mes-hall]

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“…Superconducting resonators are widely used to couple qubits based on superconducting circuits, [22][23][24] and have also been employed to couple remote electron spins. [25][26][27][28][29][30][31] They have high quality factors (Q ∼ 10 6 ) 32,33 and mature fabrication technology.…”

mentioning

confidence: 99%

“…These are microwave-frequency resonators that possess a large kinetic inductance, and they have already been successfully coupled to spins in semiconductor quantum dots. 27,28,30 There are several reasons for choosing this particular type of resonator.…”

mentioning

confidence: 99%

Toward Long-Range Entanglement between Electrically Driven Single-Molecule Magnets

Najafi

Wysocki

Park

et al. 2019

J. Phys. Chem. Lett.

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Over the past two decades, several molecules have been explored as possible building blocks of a quantum computer, a device that would provide exponential speedups for a number of problems, including the simulation of large, strongly correlated chemical systems. Achieving strong interactions and entanglement between molecular qubits remains an outstanding challenge. Here, we show that the TbPc 2 single-molecule magnet has the potential to overcome this obstacle due to its sensitivity to electric fields stemming from the hyperfine Stark effect. We show how this feature can be leveraged to achieve long-range entanglement between pairs of molecules using a superconducting resonator as a mediator. Our results suggest that the molecule-resonator interaction is near the edge of the strong-coupling regime and could potentially pass into it given a more detailed, quantitative understanding of the TbPc 2 molecule. Graphical TOC EntryKeywords single molecule magnet, TbPc 2 molecule, long-range entanglement, hyperfine Stark effect, superconducting resonator, strong-coupling limit Recently, a qubit candidate with remarkable properties was experimentally demonstrated by Thiele et al.: 16 the SMM TbPc 2 , which features a nuclear spin as the qubit, with the attractive and unusual property of being electrically controllable. This combines the best of both worlds: long-lived qubit coherence with fast controllability. This recent exciting

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Resonant microwave-mediated interactions between distant electron spins

Cited by 213 publications

References 38 publications

Resonant exchange operation in triple-quantum-dot qubits for spin–photon transduction

Resonant exchange operation in triple-quantum-dot qubits for spin–photon transduction

Electric-field control and noise protection of the flopping-mode spin qubit

Toward Long-Range Entanglement between Electrically Driven Single-Molecule Magnets

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