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Poster Session

Poster Session III

4:00 pm – 6:00 pm, Thursday June 19 Session S00 Oregon Convention Center:, Exhibit Hall E
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Quantum-Projection-Noise-Limited Readout in a Dense NV Ensemble at Room Temperature

Poster 76
Presenter: Tasuku Ono (Harvard University)
Authors: Weijie Wu (Harvard University), Che Liu (Harvard University), Haopu Yang (Harvard University), Zilin Wang (Harvard University), Lillian Hughes (University of California, Santa Barbara), Emily Davis (New York University (NYU)), Ania Jayich (University of California, Santa Barbara), Norman Yao (Harvard University)

Nitrogen-vacancy (NV) centers in diamond provide a robust platform for quantum sensing at room temperature. In dense ensembles, dipole interactions can generate metrologically advantageous entangled states, enabling sensitivity beyond the standard quantum limit (SQL). However, achieving high-fidelity spin-state readout in such systems under ambient conditions remains a challenge, as conventional fluorescence-based detection yields fidelities of only a few percent. Here, we demonstrate a quantum-projection-noise-limited readout of the spin state in a dense NV system at room temperature via the repetitive readout technique [1, 2]. This method utilizes the nitrogen nuclear spin as a quantum memory to enable ancilla-assisted quantum non-demolition measurements of the electronic spin state. Our results indicate that photon shot noise in the NV ensemble is suppressed to the level of quantum projection noise, marking a key advancement toward beyond-SQL quantum sensing.

 

[1] L. Jiang, J. S. Hodges, J. R. Maze, P. Maurer, J. M. Taylor, D. G. Cory, P. R. Hemmer, R. L. Walsworth, A. Yacoby, A. S. Zibrov, and M. D. Lukin, Science 326, 267 (2009).

[2] N. Arunkumar, K. S. Olsson, J. T. Oon, C. Hart, D. B. Bucher, D. Glenn, M. D. Lukin, H. Park, D. Ham, and R. L. Walsworth, Phys. Rev. Lett. 131, 100801 (2023).

POSTERS (141)