期刊
PHYSICAL REVIEW X
卷 12, 期 1, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevX.12.011048
关键词
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资金
- Netherlands Organisation for Scientific Research (NWO/OCW)
- European Research Council (ERC) under the European Union [852410]
- European Unions Horizon 2020 research and innovation program [820445]
- Netherlands Organisation for Scientific Research (NWO/OCW) as part of the Quantum Software Consortium program [024.003.037/3368]
- European Commission [840968]
- Frontiers of Nanoscience (NanoFront) program
- Marie Curie Actions (MSCA) [840968] Funding Source: Marie Curie Actions (MSCA)
- European Research Council (ERC) [852410] Funding Source: European Research Council (ERC)
Pairs of identical nuclear spins in solids are found to form long-lived qubits that are robust to external perturbations. These long-lived qubits are abundant in diamond and other solids, offering new opportunities for quantum sensing and quantum networks.
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 T-2* = 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.
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