An optical tweezer array of ground-state polar molecules

Zhang, Jessie T.; Picard, Lewis R. B.; Cairncross, William B.; Wang, Kenneth; Yu, Yichao; Fang, Fang; Ni, Kang-Kuen

doi:10.48550/arxiv.2112.00991

Cited by 5 publications

(6 citation statements)

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“…Because one of the most widely-used schemes to create ultracold molecules is association of the constituent atoms [37][38][39], atoms are a readily available resource in many molecule experiments, making this scheme feasible to implement. As a concrete example, for a system of NaCs molecules and Cs atoms in optical tweezers [40], we show that sub-microsecond two-qubit gate times can be realized with high fidelity and at an interparticle spacing of 1 micron. We also outline a molecular detection scheme and avenues to extend the system to larger arrays, leveraging the mobility of optical tweezers and the many internal states of molecules.…”

Section: Introductionmentioning

confidence: 95%

Enriching the quantum toolbox of ultracold molecules with Rydberg atoms

Wang¹,

Williams²,

Picard³

et al. 2022

Preprint

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We describe a quantum information architecture consisting of a hybrid array of optically-trapped molecules and atoms. This design leverages the large transition dipole moments of Rydberg atoms to mediate fast, high-fidelity gates between qubits encoded in coherent molecular degrees of freedom. Error channels of detuning, decay, pulse area noise, and leakage to other molecular states are discussed. The molecule-Rydberg interaction can also be used to enable nondestructive molecule detection and rotational state readout. We consider a specific near-term implementation of this scheme using NaCs molecules and Cs Rydberg atoms, showing that it is possible to implement 300 ns gates with a potential fidelity of > 99.9%.

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Section: Introductionmentioning

confidence: 95%

Enriching the quantum toolbox of ultracold molecules with Rydberg atoms

Wang¹,

Williams²,

Picard³

et al. 2022

Preprint

Self Cite

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show abstract

“…However, the smaller contrast between high and low detection rates causes the transmission method to be generically slower than the fluorescence method of detection. Transmission measurements with a higher C would be interaction-free [33], thus suppressing depumping errors and mechanical effects from light scattering, which provides particular advantages for detecting trapped particles, such as single molecules [34,35], that lack a cycling optical transition.…”

mentioning

confidence: 99%

Fast non-destructive cavity readout of single atoms within a coherent atom array

Deist,

Lu,

et al. 2022

Preprint

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The non-destructive measurement of a subsystem within a larger quantum system is crucial for error correction during quantum computation, simulation, and metrology, and for studying open quantum system dynamics. In many quantum technologies based on trapped atoms, measurement is performed by imaging all atoms simultaneously, a process that is typically slow and that decoheres the entire quantum system. Here, we use a strongly coupled optical cavity to read out the state of a single tweezer-trapped 87 Rb atom within a small tweezer array. Measuring either atomic fluorescence or the transmission of light through the cavity, we detect both the presence and the state of an atom in the tweezer, requiring only tens of microseconds for state-selective detection, with state preparation and measurement infidelities of roughly 0.5% and atom loss probabilities of around 1%. Using a two-tweezer system, we find measurement on one atom within the cavity causes no observable hyperfine-state decoherence on a second atom located tens of microns from the cavity volume.

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“…Here we resolve these problems, proposing how to scalably prepare a broad range of long-range entangled states with the use of existing experimental platforms. Our two-step process finds an ideal implementation in Rydberg atom arrays [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26], only requiring time-evolution under the intrinsic atomic interactions, followed by measuring a single sublattice (by using, e.g., two atom species [27][28][29][30]). Remarkably, this protocol can prepare the 1D Greenberger-Horne-Zeilinger (GHZ) 'cat' state and 2D toric code [31] with fidelity per site exceeding 0.9999, and a 3D fracton state [32][33][34] with fidelity 0.998.…”

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confidence: 99%

“…While cluster states are already of interest (serving as resources for measurementbased quantum computation [47]), to produce long-range entanglement we need to be able to measure only a subsystem of its atoms. Recent breakthrough experiments have established that this is possible in dual-species arrays [27][28][29][30][48][49][50], where one species is transparent to measurements of the other. This way, we produce the 1D GHZ, the 2D toric code and 3D fracton states.…”

mentioning

confidence: 99%