Robust entangling gate for polar molecules using magnetic and microwave fields

Hughes, Michael; Frye, Matthew D.; Sawant, Rahul; Bhole, Gaurav; Jones, Jonathan A.; Cornish, Simon L.; Tarbutt, M. R.; Hutson, Jeremy M.; Jaksch, Dieter; Mur-Petit, Jordi

doi:10.1103/physreva.101.062308

Cited by 85 publications

(61 citation statements)

References 78 publications

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“…Experimental interest in ultracold molecules is growing rapidly, spurred on by applications spanning precision measurement [1][2][3][4][5][6][7][8][9][10][11], state-resolved chemistry [12][13][14][15][16][17], dipolar quantum matter [18][19][20][21][22], quantum simulation [23][24][25][26][27][28], and quantum-information processing [29][30][31][32][33][34][35]. Two prominent methods have emerged for producing molecular gases in the ultracold regime.…”

Section: Introductionmentioning

confidence: 99%

Controlling the ac Stark effect of RbCs with dc electric and magnetic fields

et al. 2020

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We investigate the effects of static electric and magnetic fields on the differential ac Stark shifts for microwave transitions in ultracold bosonic 87 Rb 133 Cs molecules, for light of wavelength λ = 1064 nm. Near this wavelength we observe unexpected two-photon transitions that may cause trap loss. We measure the ac Stark effect in external magnetic and electric fields, using microwave spectroscopy of the first rotational transition. We quantify the isotropic and anisotropic parts of the molecular polarizability at this wavelength. We demonstrate that a modest electric field can decouple the nuclear spins from the rotational angular momentum, greatly simplifying the ac Stark effect. We use this simplification to control the ac Stark shift using the polarization angle of the trapping laser.

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Section: Introductionmentioning

confidence: 99%

Controlling the ac Stark effect of RbCs with dc electric and magnetic fields

et al. 2020

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“…Ultracold polar molecules, with their tunable long-range interactions and rich internal structures, provide a promising means for quantum simulation of novel phases of matter [1][2][3][4][5] and quantum information processing [6][7][8][9][10]. Many key ingredients of these proposals, such as the dipolar exchange interaction [11], long coherence times of nuclear spin and rotational states [12][13][14], and information transduction between different molecular degrees of freedom [15], have been demonstrated utilizing molecular gases and ions.…”

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confidence: 99%

Forming a Single Molecule by Magnetoassociation in an Optical Tweezer

Zhang

Cairncross

et al. 2020

Phys. Rev. Lett.

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We demonstrate the formation of a single NaCs molecule in an optical tweezer by magnetoassociation through an s-wave Feshbach resonance at 864.11(5) G. Starting from single atoms cooled to their motional ground states, we achieve conversion efficiencies of 47(1)%, and measure a molecular lifetime of 4.7(7) ms. By construction, the single molecules are predominantly [77(5)%] in the center-of-mass motional ground state of the tweezer. Furthermore, we produce a single p-wave molecule near 807 G by first preparing one of the atoms with one quantum of motional excitation. Our creation of a single weakly bound molecule in a designated internal state in the motional ground state of an optical tweezer is a crucial step towards coherent control of single molecules in optical tweezer arrays.

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“…As a longer-term objective, we hope that this knowledge will open the door to the characterization and implementation of quantum information devices based on trapped polar molecules 34 and their rotational degrees of freedom. [35][36][37][38] do this for N = 4 and g = 1 using numerical matrix multiplication (NMM), where the path is computed from a product of explicitly constructed matrices.…”

Section: Discussionmentioning

confidence: 99%

A path integral ground state replica trick approach for the computation of entanglement entropy of dipolar linear rotors

Sahoo

Iouchtchenko

Herdman

et al. 2020

The Journal of Chemical Physics

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We calculate the second Rényi entanglement entropy for systems of interacting linear rotors in their ground state as a measure of entanglement for continuous rotational degrees of freedom. The entropy is defined in relation to the purity of a subsystem in a bipartite quantum system, and to compute it, we compare two sampling ensembles based on the path integral ground state (PIGS) formalism. This scheme centers on the replica trick and is aided by the ratio trick, both developed in this context by Hastings et al. [Phys. Rev. Lett. 104, 157201 (2010)]. We study a system composed of linear quantum rotors on a lattice in one dimension, interacting via an anisotropic dipole-dipole potential. The ground state second Rényi entropies estimated by PIGS are benchmarked against those from the density matrix renormalization group for various interaction strengths and system sizes. We find that the entropy grows with an increase in interaction strength, and for large enough systems, it appears to plateau near log(2). We posit that the limiting case of many strongly interacting rotors behaves akin to a lattice of two-level particles in a cat state, in which one naturally finds an entanglement entropy of log(2).

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Robust entangling gate for polar molecules using magnetic and microwave fields

Cited by 85 publications

References 78 publications

Controlling the ac Stark effect of RbCs with dc electric and magnetic fields

Controlling the ac Stark effect of RbCs with dc electric and magnetic fields

Forming a Single Molecule by Magnetoassociation in an Optical Tweezer

A path integral ground state replica trick approach for the computation of entanglement entropy of dipolar linear rotors

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