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Demonstration of an always-on exchange-only spin qubit

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arxiv 2508.01033 v2 pith:XFA24QL4 submitted 2025-08-01 quant-ph cond-mat.mes-hall

Demonstration of an always-on exchange-only spin qubit

Joseph D. Broz , Jesse C. Hoke , Edwin Acuna , Jason R. Petta This is my paper
classification quant-ph cond-mat.mes-hall
keywords exchangeexchange-onlygatesquantumqubitaeonalways-onclifford
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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In conventional exchange-only (EO) spin qubit demonstrations, quantum gates have been implemented using sequences of individually pulsed pairwise exchange interactions with only one exchange coupling active at a time. Alternatively, multiple non-commuting exchange interactions can be pulsed simultaneously, reducing circuit depths and providing protection against leakage. We demonstrate high-fidelity quantum control of an always-on exchange-only (AEON) qubit, operated using simultaneous exchange pulses in a triangular quantum dot (QD) array. We use blind randomized benchmarking to characterize the performance of the full AEON single-qubit Clifford gate set, achieving an average Clifford gate fidelity $F_{\rm C1}$ = 99.86%. Extensions of this work may enable more efficient EO two-qubit entangling gates as well as the implementation of native $i$-Toffoli gates in Loss-DiVincenzo single-spin qubits.

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Cited by 4 Pith papers

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  2. CAbLECAR: efficiently scheduling QLDPC codes on a tileable spin qubit chip with shuttling

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    cond-mat.mes-hall 2026-04 unverdicted novelty 5.0

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  4. Enabling Modularity for Spin Qubits via Driven Quantum Dot-Mediated Entanglement

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    A driven mediator quantum dot enables rapid single-pulse universal entangling gates between resonant exchange qubits via capacitive coupling, avoiding complex leakage-mitigation sequences.