Room-Temperature Quantum Bit Memory Exceeding One Second

By P. Maurer, G. Kucsko, C. Latta, Liang Jiang, Norman Y. Yao, S. Bennett, Fernando Pastawski, D. Hunger, N. Chisholm, M. Markham and 3 more. Science, 2012

829 citations recorded by the source corpus.

Extending Quantum Memory Practical applications in quantum communication and quantum computation require the building blocks—quantum bits and quantum memory—to be sufficiently robust and long-lived to allow for manipulation and storage (see the Perspective by Boehme and McCarney). Steger et al. (p. 1280) demonstrate that the nuclear spins of 31P impurities in an almost isotopically pure sample of 28Si can have a coherence time of as long as 192 seconds at a temperature of ∼1.7 K. In diamond at room temperature, Maurer et al. (p. 1283) show that a spin-based qubit system comprised of an isotopic impurity (13C) in the vicinity of a color defect (a nitrogen-vacancy center) could be manipulated to have a coherence time exceeding one second. Such lifetimes promise to make spin-based architectures feasible building blocks for quantum information science. Defects in diamond can be operated as quantum memories at room temperature. Stable quantum bits, capable both of storing quantum information for macroscopic time scales and of integration inside small portable devices, are an essential building block for an array of potential applications. We demonstrate high-fidelity control of a solid-state qubit, which preserves its polarization for several minutes and features coherence lifetimes exceeding 1 second at room temperature. The qubit consists of a single 13C nuclear spin in the vicinity of a nitrogen-vacancy color center within an isotopically purified diamond crystal. The long qubit memory time was achieved via a technique involving dissipative decoupling of the single nuclear spin from its local environment. The versatility, robustness, and potential scalability of this system may allow for new applications in quantum information science.

Subfields: Atomic and Molecular Physics, and Optics, Geophysics, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/53b641e7dd89a55efbcd4c866d744aaa5e2ebc40

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Citations in the corpus

Deterministic generation of all-photonic quantum repeaters from solid-state emitters (2016, background): “Additionally dynamical decoupling pulses can extend the coherence time of qubit A by orders of magnitude [35, 36].”
Sensitivity optimization for NV-diamond magnetometry (2019, methodology): “In the 13C realizati n (Jiang et al., 2009; Maurer et al., 2012), he coupling to the ancilla spin depends on the distance between the NV- defect and the nearby 13C atom, making the technique difficult to imple ent for NV- ensembles where this dista ce v ries.”
Quantum memories: emerging applications and recent advances (2015, background): “erties for optical micro/nano-photonic devices. The possibility for optical preparation and readout of electronic and nuclear spin states [76,77], and long electronic and nuclear spin coherence times [78,79] have led to exciting experiments [80{83]. Raman excitation of spin coherences and coherent p”
Heralded entanglement between solid-state qubits separated by three metres (2012, background): “By transferring entanglement to nuclear spins near each NV centre, a nonlocal state might be preserved for seconds or longer [12], facilitating the construction of cluster states [2] or quantum repeaters [8].”