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QI: Fachverband Quanteninformation
QI 28: Surface Atom and Color Center Spin Qubits
QI 28.10: Talk
Thursday, March 21, 2024, 17:45–18:00, HFT-FT 131
Fidelity of photon-mediated entanglement between remote nuclear-spin multi-qubit registers — •Wolf-Rüdiger Hannes, Regina Finsterhoelzl, and Guido Burkard — Department of Physics, University of Konstanz, 78457 Konstanz, Germany
The nuclear spin environment of NV centers can be used to realize a multiqubit register, for which long-lived single-qubit states and high-fidelity electron-nuclear gates have been demonstrated [1]. For scalable quantum networking applications, linking registers in a photonic network is important, but has so far been realized with one nuclear spin per node only [2,3]. We theoretically analyze the requirements to extend the photonic architecture proposed by Nemoto et al. [4], which makes use of the intrinsic nitrogen spin, to multiple 13C spins per node. In particular we analyze the case where decoherence-protected gates suggested in Ref. [1] are applied consecutively and estimate a fidelity for creating multiple remote Bell pairs between two nodes. One requirement is the correction of unconditional phases acquired by unaddressed nuclear spins during a decoupling sequence. Even though the currently achieved degree of control of 13C spins might not be sufficient for large-scale devices, the two schemes are compatible in principle.
[1] C. E. Bradley, J. Randall, M. H. Abobeih et al., Phys. Rev. X 9, 031045 (2019). [2] N. Kalb, A. A. Reiserer, P. C. Humphreys et al., Science 356, 928 (2017). [3] E. Bersin, M. Sutula, Y. Q. Huan et al., arXiv:2307.08619 (2023). [4] K. Nemoto, M. Trupke, S. J. Devitt et al., Phys. Rev. X 4, 031022 (2014).
Keywords: NV centers; Hybrid quantum systems; Photonic networks; Dynamical decoupling