Witnessing Quantum Correlations in a Nuclear Spin Ensemble via a Proxy Qubit

Gangloff, Dorian; Zaporski, Leon; Bodey, Jonathan H.; Bachorz, Clara; Jackson, Daniel M.; Éthier-Majcher, Gabriel; Lang, Claire; Clarke, Edmund M.; Hugues, Maxime; Gall, Claire Le; Atatüre, Mete

doi:10.1364/qim.2021.tu3a.2

Cited by 2 publications

(2 citation statements)

References 6 publications

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“…The choice of implementing nanoscale control of spin ensembles in this work is motivated by recent proposals [35][36][37][38][39][40][41][42][43] for quantum entanglers, bona fide qubits, quantum sensing and quantum memory. In all cases, high fidelity gate operations are needed.…”

Section: Introductionmentioning

confidence: 99%

Quantum Control of Spin Qubits Using Nanomagnets

Niknam¹,

Chowdhury²,

Mahadi³

et al. 2022

Preprint

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Single-qubit gates are essential components of a universal quantum computer. Without selective addressing of individual qubits, scalable implementation of quantum algorithms is not possible. When the qubits are discrete points or regions on a lattice, the selective addressing of magnetic spin qubits at the nanoscale remains a challenge due to the difficulty of localizing and confining a classical divergence-free field to a small volume of space. Herein we propose a new technique for addressing spin qubits using voltage-control of nanoscale magnetism, exemplified by the use of voltage control of magnetic anisotropy (VCMA). We show that by tuning the frequency of the nanomagnet's electric field drive to the Larmor frequency of the spins confined to a nanoscale volume, and by modulating the phase of the drive, single-qubit quantum gates with fidelities approaching those for fault-tolerant quantum computing can be implemented. Such single-qubit gate operations have the advantage of remarkable energy efficiency, requiring only tens of femto-Joules per gate operation, and lossless, purely magnetic field control (no E-field over the target volume). Their physical realization is also straightforward using existing foundry manufacturing techniques.

show abstract

Section: Introductionmentioning

confidence: 99%

Quantum Control of Spin Qubits Using Nanomagnets

Niknam¹,

Chowdhury²,

Mahadi³

et al. 2022

Preprint

View full text Add to dashboard Cite

show abstract

“…The choice of implementing nanoscale control of spin ensembles in this work is motivated by recent proposals [44][45][46][47][48][49][50][51][52] for quantum entanglers, bona fide qubits, quantum sensing and quantum memory. In all cases, high fidelity gate operations are needed.…”

mentioning

confidence: 99%

Quantum control of spin qubits using nanomagnets

et al. 2022

View full text Add to dashboard Cite

Single-qubit gates are essential components of a universal quantum computer. Without selective addressing of individual qubits, scalable implementation of quantum algorithms is extremely challenging. When the qubits are discrete points or regions on a lattice, selectively addressing magnetic spin qubits at the nanoscale remains a challenge due to the difficulty of localizing and confining a classical divergence-free field to a small volume of space. Herein we propose a technique for addressing spin qubits using voltage-control of nanoscale magnetism, exemplified by the use of voltage control of magnetic anisotropy. We show that by tuning the frequency of the nanomagnet’s electric field drive to the Larmor frequency of the spins confined to a nanoscale volume, and by modulating the phase of the drive, single-qubit quantum gates with fidelities approaching those for fault-tolerant quantum computing can be implemented. Such single-qubit gate operations require only tens of femto-Joules per gate operation and have lossless, purely magnetic field control. Their physical realization is also straightforward using foundry manufacturing techniques.

show abstract

Witnessing Quantum Correlations in a Nuclear Spin Ensemble via a Proxy Qubit

Abstract: A resident electron spin in a semiconductor nanostructure is an interface to an ensemble of nuclear spins, and witnesses the creation of entanglement within the ensemble in the form of dark-state coherences.

Cited by 2 publications

References 6 publications

Quantum Control of Spin Qubits Using Nanomagnets

Quantum Control of Spin Qubits Using Nanomagnets

Quantum control of spin qubits using nanomagnets

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