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Entanglement and iSWAP gate between molecular qubits

https://doi.org/10.1038/s41586-024-08177-3

Picard, Lewis_R B; Park, Annie J; Patenotte, Gabriel E; Gebretsadkan, Samuel; Wellnitz, David; Rey, Ana Maria; Ni, Kang-Kuen (January 2025, Nature)

Free, publicly-accessible full text available January 23, 2026
Broadband High-Precision Faraday Rotation Spectroscopy with Uniaxial Single Crystal CeF3 Modulator

https://doi.org/10.3390/photonics11040304

Lacy, John H; Patenotte, Gabriel E; Kinney, Abby C; Majumder, Protik K (April 2024, Photonics)

We present a low-noise (<10 µrad/Hz) broadband Faraday Rotation Spectroscopy method which is feasible for near-ultraviolet through near-infrared wavelengths. We demonstrate this in the context of a high-precision spectroscopy experiment using a heated Pb vapor cell and two different lasers, one in the UV (368 nm) and a second in the IR (1279 nm). A key element of the experimental technique is the use of a uniaxial single crystal CeF3 Faraday modulator with excellent transmission and optical rotation properties across the aforementioned wavelength range. Polarimeter performance is assessed as a function of crystal orientation and alignment, AC modulation amplitude, laser power, and laser wavelength. Crystal-induced distortion of the (6p2)3P0→(6p2)3P1 (1279 nm) and (6p2)3P1→(6p7s)3P0 (368 nm) spectral lines due to misalignment-induced birefringence is discussed and modeled using the Jones calculus.
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Extended rotational coherence of polar molecules in an elliptically polarized trap

Park, Annie J.; Picard, Lewis; Patenotte, Gabriel; Zhang, Jesse. T.; Rosenband; Till, Ni (January 2023, arXivorg)

We demonstrate long rotational coherence of individual polar molecules in the motional ground state of an optical trap. In the present, previously unexplored regime, the rotational eigenstates of molecules are dominantly quantized by trapping light rather than static fields, and the main source of decoherence is differential light shift. In an optical tweezer array of NaCs molecules, we achieve a three-orders-of-magnitude reduction in differential light shift by changing the trap’s polarization from linear to a specific “magic” ellipticity. With spin-echo pulses, we measure a rotational coherence time of 62(3) ms (one pulse) and 250(40) ms (up to 72 pulses), surpassing the projected duration of resonant dipole-dipole entangling gates by orders of magnitude
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High resolution photoassociation spectroscopy of the excited $c^{3} Σ_{1}^{+}$ potential of ${}^{23}{Na} {}^{133}{Cs}$

https://doi.org/10.1103/PhysRevResearch.5.023149

Picard, Lewis R.; Zhang, Jessie T.; Cairncross, William B.; Wang, Kenneth; Patenotte, Gabriel E.; Park, Annie J.; Yu, Yichao; Liu, Lee R.; Hood, Jonathan D.; González-Férez, Rosario; et al (June 2023, Physical Review Research)

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