Tunable itinerant spin dynamics with polar molecules

Li, Jun-Ru; Matsuda, Kyle; Miller, Calder; Carroll, Annette N.; Tobias, William G.; Higgins, Jacob S.; Ye, Jun

doi:10.1038/s41586-022-05479-2

Cited by 38 publications

(8 citation statements)

References 54 publications

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“…3F). Experiments with bulk samples of bialkali molecules in optical lattices have observed coherent spin-exchange both through macroscopic measurements ( 21 , 37 ) and with single-molecule resolution ( 18 ), whereas in this work, we observed coherent interactions between individually prepared, laser-cooled molecules.…”

Section: Observing Coherent Intermolecular Interactionsmentioning

confidence: 64%

“…Adding a spin-echo improves the coherence time to T 2 = 29(2) ms. Following previous work that explored dipolar interactions of KRb molecules in an optical lattice ( 21 , 37 ), we implemented the XY8 dynamical decoupling sequence depicted in Fig. 3B and found that the 1/ e coherence time was further extended to 215(30) ms (Fig.…”

Section: Probing Rotational Coherence Of Single Moleculesmentioning

confidence: 99%

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On-demand entanglement of molecules in a reconfigurable optical tweezer array

Holland,

Lu,

Cheuk

2023

Science

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Entanglement is crucial to many quantum applications, including quantum information processing, quantum simulation, and quantum-enhanced sensing. Because of their rich internal structure and interactions, molecules have been proposed as a promising platform for quantum science. Deterministic entanglement of individually controlled molecules has nevertheless been a long-standing experimental challenge. We demonstrate on-demand entanglement of individually prepared molecules. Using the electric dipolar interaction between pairs of molecules prepared by using a reconfigurable optical tweezer array, we deterministically created Bell pairs of molecules. Our results demonstrate the key building blocks needed for quantum applications and may advance quantum-enhanced fundamental physics tests that use trapped molecules.

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Section: Observing Coherent Intermolecular Interactionsmentioning

confidence: 64%

Section: Probing Rotational Coherence Of Single Moleculesmentioning

confidence: 99%

On-demand entanglement of molecules in a reconfigurable optical tweezer array

Holland,

Lu,

Cheuk

2023

Science

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“…The immersion of vanadyl units in a strongly π-conjugated scaffold places the systems in the strong coupling regime, increasing their exchange interaction and protecting the phase memory time, as previously observed in non-molecular systems. The use of 2D electron gases to connect spins without suppressing their coherence has been observed in surface nanostructures made of semiconductors, [94][95][96][97] and the origins of this effect remain subject to debate. 98,99 Our observation of this effect at the molecular scale can now prompt a rigorous theoretical analysis, in systems where every atomic position is known and that can be modelled in detail.…”

Section: Discussionmentioning

confidence: 99%

Enhanced Coherence by Coupling Spins through a Delocalized π-System: Vanadyl Porphyrin Dimers

Pozo

Huang

Lombardi

et al. 2023

Preprint

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Vanadium(IV) magnetic centers are prime candidates as molecular quantum units. One longstanding question is how to obtain a scaffold that connects multiple centers and allows two communication modalities: magnetic and electronic. We have synthesized and studied a selection of vanadyl porphyrin dimers, as models of the most synthetically accessible linear porphyrin arrays. We show that a strongly π-conjugated backbone places the magnetic system in the strong coupling regime and protects the quantum coherence against electron pair flip-flop processes at low temperatures (<10 K). This result is a fundamental step towards the design of molecular materials for single-molecule devices controlled by microwaves with electrical readout.

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“…J is the dipolar interaction strength that can be further expressed asJ=d24πϵ0r31−3cos2θwhere d is the transition dipole moment between the ↑ and ↓ state ( d ≈ 1 Debye), ϵ 0 is the vacuum permittivity, r is the intermolecular spacing, and θ is the angle between the quantization axis and the intermolecular axis direction. Apart from molecular systems ( 27 , 30 , 33 ), this XY spin Hamiltonian was previously studied with Rydberg atoms in optical tweezers ( 56 ) and atoms in optical lattices ( 57 , 58 ).…”

Section: Coherent Dipolar Spin-exchange Interactionmentioning

confidence: 99%

Dipolar spin-exchange and entanglement between molecules in an optical tweezer array

Bao,

Yu,

Anderegg

et al. 2023

Science

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Ultracold polar molecules are promising candidate qubits for quantum computing and quantum simulations. Their long-lived molecular rotational states form robust qubits, and the long-range dipolar interaction between molecules provides quantum entanglement. In this work, we demonstrate dipolar spin-exchange interactions between single calcium monofluoride (CaF) molecules trapped in an optical tweezer array. We realized the spin-12quantum XY model by encoding an effective spin-12system into the rotational states of the molecules and used it to generate a Bell state through an iSWAP operation. Conditioned on the verified existence of molecules in both tweezers at the end of the measurement, we obtained a Bell state fidelity of 0.89(6). Using interleaved tweezer arrays, we demonstrate single-site molecular addressability.

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Tunable itinerant spin dynamics with polar molecules

Cited by 38 publications

References 54 publications

On-demand entanglement of molecules in a reconfigurable optical tweezer array

On-demand entanglement of molecules in a reconfigurable optical tweezer array

Enhanced Coherence by Coupling Spins through a Delocalized π-System: Vanadyl Porphyrin Dimers

Dipolar spin-exchange and entanglement between molecules in an optical tweezer array

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