Optical control of entanglement and coherence for polar molecules in pendular states

Zhang, Zuo-Yuan; Liu, Jin-Ming; Hu, Zhengfa; Wang, Yuzhu

doi:10.1364/oe.27.026588

Cited by 10 publications

(4 citation statements)

References 61 publications

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“…In ref , the scheme based on OCT has been proposed to achieve the Bell states of 1 / 2 ( false| 00 ⟩ + false| 11 false⟩ ) and 1 / 2 ( false| 01 ⟩ + false| 10 false⟩ ) , with the fidelities of 0.9906 and 0.9813, respectively. However, the assumed intermolecular distance r 12 in that study is a very small value of 85 nm, which can lead to unacceptably large decoherence and may also be unrealistic in the current experiments.…”

Section: Resultsmentioning

confidence: 99%

“…In our previous study, we have utilized OCT to implement entangled states and quantum gates in the polar molecular system. − In those studies, the molecule spacing is reluctantly set to values far less than the ones achieved under the current experimental technique. Moreover, to further reduce the computation costs while achieving high fidelity, refs , and take the SrO molecules with large electric dipole moments (nearly 9 D) as candidate qubits.…”

Section: Discussionmentioning

confidence: 99%

“…Here, the electric field is supposed to have a proper gradient, resulting in different Stark effects at each molecular site, thereby allowing the molecular qubits to be addressable individually. In some previous studies, the quantum logic gates, quantum algorithms, and coherent control in pendular qubit states have been achieved using the optimal control theory (OCT). − However, for convenience of numerical calculations, in those studies, some physical parameters (e.g., molecular spacing) are assumed with unrealistic values. We note that Bukov et al applied the RL technique to many-body quantum systems composed of interacting qubits and successfully discovered the driving protocol that can prepare high-fidelity desired states.…”

Section: Introductionmentioning

confidence: 99%

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Entanglement Generation of Polar Molecules via Deep Reinforcement Learning

Zhang,

Sun,

Duan

et al. 2024

J. Chem. Theory Comput.

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Polar molecules are a promising platform for achieving scalable quantum information processing because of their long-range electric dipole–dipole interactions. Here, we take the coupled ultracold CaF molecules in an external electric field with gradient as qubits and concentrate on the creation of intermolecular entanglement with the method of deep reinforcement learning (RL). After sufficient training episodes, the educated RL agents can discover optimal time-dependent control fields that steer the molecular systems from separate states to two-qubit and three-qubit entangled states with high fidelities. We analyze the fidelities and the negativities (characterizing entanglement) of the generated states as a function of training episodes. Moreover, we present the population dynamics of the molecular systems under the influence of control fields discovered by the agents. Compared with the schemes for creating molecular entangled states based on optimal control theory, some conditions (e.g., molecular spacing and electric field gradient) adopted in this work are more feasible in the experiment. Our results demonstrate the potential of machine learning to effectively solve quantum control problems in polar molecular systems.

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Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Entanglement Generation of Polar Molecules via Deep Reinforcement Learning

Zhang,

Sun,

Duan

et al. 2024

J. Chem. Theory Comput.

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“…More generally, one can consider engineering the desired pulses to generate states or correct errors via established optimal-control schemes [38,63]. It has been shown that one can control the planar [64,65], linear [66][67][68], and even rigid [69] rotors, and it would be useful to extend these and other efforts [70,71] to stabilizing the required code subspace.…”

Section: Experimental Realizationsmentioning

confidence: 99%

Encoding a qubit in a molecule

Albert

Covey

Preskill

2019

Rochester Conference on Coherence and Quantum Optics (CQO-11)

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We construct quantum error-correcting codes that embed a finite-dimensional code space in the infinite-dimensional Hilbert state space of rotational states of a rigid body. These codes, which protect against both drift in the body's orientation and small changes in its angular momentum, may be well suited for robust storage and coherent processing of quantum information using rotational states of a polyatomic molecule. Extensions of such codes to rigid bodies with a symmetry axis are compatible with rotational states of diatomic molecules, as well as nuclear states of molecules and atoms. We also describe codes associated with general nonabelian compact Lie groups and develop orthogonality relations for coset spaces, laying the groundwork for quantum information processing with exotic configuration spaces.

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Coherence and entropic uncertainty relation of dipole-coupled qubits under decoherence

Zhang

2022

Physica A: Statistical Mechanics and its Applications

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Optical control of entanglement and coherence for polar molecules in pendular states

Cited by 10 publications

References 61 publications

Entanglement Generation of Polar Molecules via Deep Reinforcement Learning

Entanglement Generation of Polar Molecules via Deep Reinforcement Learning

Encoding a qubit in a molecule

Coherence and entropic uncertainty relation of dipole-coupled qubits under decoherence

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