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Entanglement of Spin-Pair Qubits with Intrinsic Dephasing Times Exceeding a Minute

Journal Article (2022)
Author(s)

H. P. Bartling (TU Delft - QuTech Advanced Research Centre, TU Delft - QID/Taminiau Lab, Kavli institute of nanoscience Delft)

M. H. Abobeih (TU Delft - QID/Taminiau Lab, Kavli institute of nanoscience Delft, TU Delft - QuTech Advanced Research Centre)

B. Pingault (Kavli institute of nanoscience Delft, TU Delft - QID/Taminiau Lab, TU Delft - QuTech Advanced Research Centre, Harvard University)

M. J. Degen (Kavli institute of nanoscience Delft, TU Delft - QuTech Advanced Research Centre, TU Delft - QID/Hanson Lab)

S. J.H. Loenen (TU Delft - QID/Taminiau Lab, Kavli institute of nanoscience Delft, TU Delft - QuTech Advanced Research Centre)

C. E. Bradley (Kavli institute of nanoscience Delft, TU Delft - QID/Taminiau Lab, TU Delft - QuTech Advanced Research Centre)

J. Randall (TU Delft - QID/Taminiau Lab, TU Delft - QuTech Advanced Research Centre, Kavli institute of nanoscience Delft)

M. Markham (Element Six Innovation)

D. J. Twitchen (Element Six Innovation)

T. H. Taminiau (TU Delft - QID/Taminiau Lab, Kavli institute of nanoscience Delft, TU Delft - QuTech Advanced Research Centre)

Research Group
QID/Taminiau Lab
DOI related publication
https://doi.org/10.1103/PhysRevX.12.011048
More Info
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Publication Year
2022
Language
English
Research Group
QID/Taminiau Lab
Issue number
1
Volume number
12
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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.