Rydberg atom mediated non-destructive readout of collective rotational states in polar molecule arrays

Abstract

We analyze in detail the possibility to use charge-dipole interaction between a single polar molecule or a 1D molecular array and a single Rydberg atom to read out rotational populations. The change in the Rydberg electron energy is conditioned on the rotational state of the polar molecules, allowing for realization of a CNOT quantum gate between the molecules and the atom. Subsequent readout of the atomic fluorescence results in a non-destructive measurement of the rotational state. We study the interaction between a 1D array of polar molecules and an array or a cloud of atoms in a Rydberg superatom (blockaded) state and calculate the resolved energy shifts of Rb(60s) with KRb and RbYb molecules, with N=1, 3, 5 molecules. We show that collective molecular rotational states can be read out using the conditioned Rydberg energy shifts.

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• Trilobites, butterflies, and other exotic specimens of long-range Rydberg molecules
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• Enriching the quantum toolbox of ultracold molecules with Rydberg atoms
• Enhanced quantum control of individual ultracold molecules using optical tweezer arrays
• Control of Localized Multiple Excitation Dark States in Waveguide QED
• Observation of Rydberg blockade due to the charge-dipole interaction between an atom and a polar molecule
• Preparation of circular Rydberg states in helium with $n\ge 70$ using a modified version of the crossed-fields method
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