Proposal for the Creation and Optical Detection of Spin Cat States in Bose-Einstein Condensates

Lau, Hon Wai; Dutton, Zachary; Simon, Christoph

doi:10.1103/physrevlett.113.090401

Cited by 34 publications

(34 citation statements)

References 51 publications

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“…Continuing the interaction for another τ c , one can observe the revival of the initial CSS. This revival can be used as proof for the successful creation of a quantum superposition at τ c , since a statistical mixture of CSS at τ c would evolve into another mixture of separate peaks [16,34].…”

Section: −Imentioning

confidence: 97%

Large energy superpositions via Rydberg dressing

et al. 2016

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We propose to create superposition states of over 100 Strontium atoms being in a ground state or metastable optical clock state, using the Kerr-type interaction due to Rydberg state dressing in an optical lattice. The two components of the superposition can differ by of order 300 eV in energy, allowing tests of energy decoherence models with greatly improved sensitivity. We take into account the effects of higher-order nonlinearities, spatial inhomogeneity of the interaction, decay from the Rydberg state, collective many-body decoherence, atomic motion, molecular formation and diminishing Rydberg level separation for increasing principal number.

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Section: −Imentioning

confidence: 97%

Large energy superpositions via Rydberg dressing

et al. 2016

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“…In contrast to Ref. [16], where the Husimi function of the macroscopic superposition was considered (this distribution does not exhibit fringes), we look at the interference fringes of the Wigner function to quantify the survival of quantum correlations in the presence of decoherence (see Ref. [17]).…”

Section: Introductionmentioning

confidence: 99%

Mesoscopic quantum superpositions in bimodal Bose-Einstein condensates: Decoherence and strategies to counteract it

et al. 2017

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We study theoretically the interaction-induced generation of mesoscopic coherent spin state superpositions (small-particle-number cat states) from an initial coherent spin state in bimodal Bose-Einstein condensates and the subsequent phase revival, including decoherence due to particle losses and fluctuations of the total particle number. In a full multimode description, we propose a preparation procedure of the initial coherent spin state and we study the effect of preexisting thermal fluctuations on the phase revival, and on the spin and orbito-spinorial cat-state fidelities.

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“…A quadratic interaction between spins [7][8][9]15,17,[23][24][25][26][27][28][29], the QND interaction [30,31], and the dispersive Tavis-Cummings interaction [32,33] generate these spin cat states, whereas a series of controlled-NOT gates [10,16,34] or a sequence of spin measurements [35][36][37][38] have been proposed. The quadratic interaction, essentially equivalent to the sequence of the controlled-NOT gates [39,40], shows better scalability with respect to the number of spins.…”

Section: Introductionmentioning

confidence: 99%

Fast macroscopic-superposition-state generation by coherent driving

2018

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We propose a scheme to generate macroscopic superposition states (MSSs) in spin ensembles, where a coherent driving field is applied to accelerate the generation of macroscopic superposition states. The numerical calculation demonstrates that this approach allows us to generate a superposition of two classically distinct states of the spin ensemble with a high fidelity above 0.97 for 300 spins. For a larger spin ensemble, though the fidelity slightly declines, it maintains above 0.84 for an ensemble of 500 spins. The time to generate an MSS is also estimated, which shows that the significantly shortened generation time allows us to achieve such MSSs within a typical coherence time of the system.

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Proposal for the Creation and Optical Detection of Spin Cat States in Bose-Einstein Condensates

Cited by 34 publications

References 51 publications

Large energy superpositions via Rydberg dressing

Large energy superpositions via Rydberg dressing

Mesoscopic quantum superpositions in bimodal Bose-Einstein condensates: Decoherence and strategies to counteract it

Fast macroscopic-superposition-state generation by coherent driving

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