Abstract
Understanding and protecting the coherence of individual quantum systems is a central challenge in quantum science and technology. Over the past decades, a rich variety of methods to extend coherence have been developed. A complementary approach is to look for naturally occurring systems that are inherently protected against decoherence. Here, we show that pairs of identical nuclear spins in solids form intrinsically long-lived qubits. We study three carbon-13 pairs in diamond and realize high-fidelity measurements of their quantum states using a single nitrogen-vacancy center in their vicinity. We then reveal that the spin pairs are robust to external perturbations due to a combination of three phenomena: a decoherence-free subspace, a clock transition, and a variant on motional narrowing. The resulting inhomogeneous dephasing time is T2∗=1.9(3) min, the longest reported for individually controlled qubits. Finally, we develop complete control and realize an entangled state between two spin pairs through projective parity measurements. These long-lived qubits are abundantly present in diamond and other solids and provide new opportunities for ancilla-enhanced quantum sensing and for robust memory qubits for quantum networks.
Original language | English |
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Article number | 011048 |
Number of pages | 15 |
Journal | Physical Review X |
Volume | 12 |
Issue number | 1 |
DOIs | |
Publication status | Published - 2022 |
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Data underlying the publication: Entanglement of Spin-Pair Qubits with Intrinsic Dephasing Times Exceeding a Minute
Bartling, H. P. (Creator), Abobeih, M. H. M. A. (Creator), Pingault, B. J. (Creator), Degen, M. J. (Creator), Loenen, S. J. H. (Creator), Bradley, C. E. (Creator), Randall, J. A. D. (Creator), Markham, M. (Creator), Twitchen, D. J. (Creator) & Taminiau, T. H. (Creator), TU Delft - 4TU.ResearchData, 21 Apr 2023
DOI: 10.4121/719A906A-72FB-4A3A-A371-F50CB09E3B75
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