Fundamental and technical aspects of neutral atom entanglement via adiabatic Rydberg dressing

Interactions between Rydberg states have been used to entangle neutral Rubidium, Cesium, Strontium and Ytterbium atoms. Adiabatic Rydberg dressing, involving an adiabatic passage from ground states to Rydberg states and back, is a way of using the Rydberg state interaction energy to accumulate non-local phases. Adiabatic Rydberg dressing using one-photon transition from ground to Rydberg states with a spin-echo sequence can be used to implement a Mølmer-Sørensen gate that is robust to many experimental uncertainties [1, 2, 3]. We discuss rapid adiabatic passages using a two-photon transition, which do not require an ultra-violet laser and are easier to implement, using only amplitude modulation of one laser. We estimate the fundamental limits to non-local phase accumulation via Rydberg dressing and its scaling with Rabi frequency, detuning, interaction energy and Rydberg state lifetime. We find that qubit entanglers can be achieved with high fidelity using adiabatic Rydberg dressing across different blockade regimes using adiabatic passages and spin-echo, providing a promising tool for neutral atom quantum computation.



[1] A. Mitra et. al. Phys. Rev. A, 101(3), 030301(R) (2020)

[2] M. J. Martin et. al., arXiv:2111.14677

[3] N. Schine et. al., arXiv:2111.14653