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Poster Session I (4pm-6pm CDT)

4:00 pm – 6:00 pm, Tuesday June 4 Session D00
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Towards Coherent Excitation to Rydberg States for Quantum Computing using home-made Continuous Wave (CW) Lasers

Poster 83
Presenter: Karthikeyan G Kumaran (Indian Institute of Science Education and Research, Kolkata)
Authors: Yeelai Chew (Institute for Molecular Science, National Institutes of Natural Sciences, Japan), Sylvain DE LESELEUC (Institute for Molecular Science. NINS. Japan), Takafumi Tomita (Institute for Molecular Science, National Institutes of Natural Sciences, Japan), Kenji Ohmori (Institute for Molecular Science, Natl Inst of Natural Sci)

Rydberg excitation plays a pivotal role in quantum computing and simulation with cold atoms trapped in optical tweezers, specifically in the implementation of two qubit quantum gates1 or the realization of Ising spin models2. A crucial characteristic for high fidelity operation is a low phase/frequency noise of the lasers driving the Rydberg excitation3. Towards this end, we report on a homebuilt 780 nm laser incorporating a two-stage phase/frequency noise stabilization. The laser source is a 780 nm External Cavity Diode Laser (ECDL) using an interference filter4 to select a single longitudinal mode. The first stage of phase stabilization is a standard Pound-Drever-Hall scheme5 stabilizing the laser phase/frequency up to Fourier frequencies of ~1 MHz (microsecond timescale), limited by the feedback loop bandwidth. To further extend the stabilization to faster timescale, we added a fast feedforward cancellation system to suppress noise in the 0.1-10 MHz frequency band6.

References:

1Jaksch, Dieter, et al. "Fast quantum gates for neutral atoms." Phys. Rev. Lett. 85, 2208 (2000)

2Browaeys, Antoine, and Thierry Lahaye. "Many-body physics with individually controlled Rydberg atoms.” Nat. Phys. 16, 132 (2020)

3de Léséleuc, Sylvain, et al. "Analysis of imperfections in the coherent optical excitation of single atoms to Rydberg states." Phys. Rev. A 97, 053803 (2018)

4Baillard, Xavier, et al. "Interference-filter-stabilized external-cavity diode lasers." Opt. Commun. 266, 609 (2006)

5Black, Eric D. "An introduction to Pound–Drever–Hall laser frequency stabilization" Am. J. Phys. 69, 79 (2001)

6Denecker-Desmonts, Tom, et al. Harry, et al. "Fast feed-forward cancellation of laser phase noise for cold atom experiments." N01.00138, Poster, DAMOP2023

Funding acknowledgement

This work was supported by the MOONSHOT Research and Development Program. We also thank the group of Prof. Christian Gross at the University of Tübingen for providing us their IF-ECDL laser design, supported by a NINS-DAAD exchange program.

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