Two-photon Rydberg excitation of neutral atoms in optical dipole-trap arrays

Erich Urban, Todd A. Johnson, Thomas Henage +5 more

I. I. Ryabtsev, K. Yu. Mityanin, Ilya I. Beterov +5 more

Abstract A brief overview of experimental and theoretical studies on the use of single neutral atoms captured in arrays of optical dipole traps as qubits of a quantum computer is presented. Methods for loading and registering atoms in traps, and performing two-qubit quantum logic gates via dipole-dipole interaction during short-term laser excitation of atoms into Rydberg states are discussed.

Gregory Smail, Mark Bashkansky, Adam T. Black

Neutral atoms are widely used for quantum computing and quantum information applications due to their scalability and high-fidelity Rydberg interactions. Recently, dual-species single atom arrays have been demonstrated in which one species is used for computation and the other is used to perform auxiliary mid-circuit measurements. We propose the co-location of two ensembles of ultracold 85Rb and 87Rb in a crossed-beam optical dipole trap for quantum information applications. Due to the isotope shift, crosstalk between the ensembles is small and each ensemble can be addressed independently. The trapped ensembles can be made to support only a single collective Rydberg excitation while providing robustness against collisional losses. We present progress towards the independent control of two Rb ensembles co-located in a dual-species crossed beam optical dipole trap and discuss measurements of the crosstalk between the ensembles.

Gerard T. Higgins

I. V. Iukhnovets, M. Y. Goloshchapov, A. P. Gordeev +4 more

We present a method for generating a laser beam with flat intensity and phase profiles in the focal region where the beam interacts with neutral $^{87}$Rb atoms in an array of optical dipole traps. We synthesize the beam as a superposition of Hermite--Gaussian or Laguerre--Gaussian modes. Then we give analytical expressions for the coefficients of such a superposition, an analysis of beam propagation along the $z$ axis in the vicinity of the waist, and several other related theoretical issues. Rydberg two-qubit dynamics driven by this flat-top profile are analyzed through numerical solutions of the Lindblad master equation using our in-house Julia package. Beam preparation is demonstrated on a neutral-atom experimental platform. Measurements reveal a difference in the visibility of Rabi oscillations for addressed atoms compared with neighboring ones, confirming the effective spatial selectivity provided by the flat-top beam profile.

X.L. Zhang, Alexander Gill, Michael J. Gibbons +4 more