Solid-state electronic spin coherence time approaching one second
By N. Bar-Gill, L. Pham, Andrejs Jarmola, Dmitry Budker, R. Walsworth. Nature Communications, 2012
774 citations recorded by the source corpus.
Solid-state spin systems such as nitrogen-vacancy colour centres in diamond are promising for applications of quantum information, sensing and metrology. However, a key challenge for such solid-state systems is to realize a spin coherence time that is much longer than the time for quantum spin manipulation protocols. Here we demonstrate an improvement of more than two orders of magnitude in the spin coherence time (T2) of nitrogen-vacancy centres compared with previous measurements: T2≈0.6 s at 77 K. We employed dynamical decoupling pulse sequences to suppress nitrogen-vacancy spin decoherence, and found that T2 is limited to approximately half of the longitudinal spin relaxation time over a wide range of temperatures, which we attribute to phonon-induced decoherence. Our results apply to ensembles of nitrogen-vacancy spins, and thus could advance quantum sensing, enable squeezing and many-body entanglement, and open a path to simulating driven, interaction-dominated quantum many-body Hamiltonians. Nitrogen-vacancy centres in diamond are a promising route for solid-state quantum information processing and magnetometry, but longer coherence times are needed to optimize protocols. Here, Bar-Gill et al. suppress decoherence to realize nitrogen-vacancy spin coherence times approaching one second.
Subfields: Atomic and Molecular Physics, and Optics, Geophysics, Materials Chemistry
View Paper: https://www.semanticscholar.org/paper/7c759948451ef8b2f0aa493687a3d816217d97ea
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Citations in the corpus
- Simultaneous Broadband Vector Magnetometry Using Solid-State Spins (2018, methodology): “Sequences denoted + and − differ in phase by 180◦ and yield equal and opposite PL contrast signals from a DC magnetic field [19, 43, 59].”
- An addressable quantum dot qubit with fault-tolerant control-fidelity. (2014, background): “ized on atoms or defects have been realized in almost spinfree environments, showing coherence times approaching[4] and even exceeding seconds[5].”
- Quantum metrology and its application in biology (2014, background): “8 ms have been achieved at 77 K [212] and room temperature [217], respectively.”
- Quantum nanophotonics in diamond [Invited] (2016, background): “Moreover, several defects allow for optical access to associated electron and nuclear spin states, which can exhibit long coherence times [10], enabling their use as quantum memories [11] in QI applications ] 12 ].”
- Decoherence of ensembles of nitrogen-vacancy centers in diamond (2020, background): “5 ms [28].”
- Scalable Integration of Long-Lived Quantum Memories into a Photonic Circuit (2014, background): “A promising solid-state quantum memory with secondscale spin coherence times is the negatively charged nitrogen vacancy (NV) center in diamond [7, 8].”
- Sensitivity optimization for NV-diamond magnetometry (2019, background): “Multi-pulse sequences performed at 77 K have demonstrated > 100× extensions in T2 compared to room temperature measurements (Bar-Gill et al., 2013), and corresponding improvements to AC magnetic field sensitivity are expected.”
- Deterministic delivery of remote entanglement on a quantum network (2017, background): “Nitrogen vacancy (NV) centres, point-defects in diamond with a long-lived electron spin and bright optical transitions, have demonstrated entanglement rates rent of tens of mHz [10, 14] and, in separate experiments, decoherence rates rdec of order 1 Hz [20], which would together give η link ∼ 10−2.”