Observation of the Hanbury Brown–Twiss effect with ultracold molecules

Rosenberg, Jason; Christakis, Lysander; Guardado-Sanchez, Elmer; Yan, Zoe; Bakr, Waseem

doi:10.1038/s41567-022-01695-9

Cited by 18 publications

(4 citation statements)

References 45 publications

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“…While many experiments using bosonic alkali atoms can benefit from a good signal of SNR ⩾ 3, imaging other atomic species is more challenging. When imaging fermionic alkali atoms we obtain at a typical SNR of 2 [33] and in new experiments with ultracold molecules and (non-cooled) earth-alkalis, even lower signal levels of SNR ≈ 1.5 are encountered [48,49]. Using our methods, reliable atom detection far below the diffraction limit (β < 0.5) is not possible.…”

Section: Discussionmentioning

confidence: 89%

A comparative study of deconvolution techniques for quantum-gas microscope images

Rooij

Haller

et al. 2023

New J. Phys.

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Quantum-gas microscopes are used to study ultracold atoms in optical lattices at the single-particle level. In these system atoms are localised on lattice sites with separations close to or below the diffraction limit. To determine the lattice occupation with high fidelity, a deconvolution of the images is often required. We compare three different techniques, a local iterative deconvolution algorithm, Wiener deconvolution and the Lucy-Richardson algorithm, using simulated microscope images. We investigate how the reconstruction fidelity scales with varying signal-to-noise ratio, lattice filling fraction, varying fluorescence levels per atom, and imaging resolution. The results of this study identify the limits of singe-atom detection and provide quantitative fidelities which are applicable for different atomic species and quantum-gas microscope setups. 

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Section: Discussionmentioning

confidence: 89%

A comparative study of deconvolution techniques for quantum-gas microscope images

Rooij

Haller

et al. 2023

New J. Phys.

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“…Pioneered with atomic gases, this technique has enabled unprecedented local observations of quantum phase transitions, spin and charge correlations in Hubbard systems, and impurity physics [23]. Recently, we have extended microscopy techniques to quantum gases of non-interacting excited-state molecules, observing bosonic bunching correlations in their density fluctuations [39].…”

Section: Two Complementary Approaches Have Been Developedmentioning

confidence: 99%

“…For imaging, we reverse the STIRAP process, transferring molecules in |↑ to the weakly bound Feshbach state, which we then dissociate. We detect the resulting Rb atoms with fluorescence imaging, allowing us to extract the position of each molecule in |↑ with single-site resolution [39]. We do not detect the molecules in |↓ , so our current measurements do not distinguish between that state and an empty site, although this may be achieved in future work with bilayer techniques used for spin-resolved imaging in atomic microscopes [44,45].…”

Section: Molecule Preparation and Detectionmentioning

confidence: 99%

Probing site-resolved correlations in a spin system of ultracold molecules

Christakis¹,

Rosenberg²,

Raj³

et al. 2022

Preprint

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Synthetic quantum systems with interacting constituents play an important role in quantum information processing and in elucidating fundamental phenomena in many-body physics. Following impressive advances in cooling and trapping techniques, ensembles of ultracold polar molecules have emerged as a promising synthetic system that combines several advantageous properties [1][2][3][4][5][6][7][8][9][10][11]. These include a large set of internal states for encoding quantum information, long nuclear and rotational coherence times [12][13][14][15][16][17] and long-range, anisotropic interactions. The latter are expected to allow the exploration of intriguing phases of correlated quantum matter, such as topological superfluids [18], quantum spin liquids [19], fractional Chern insulators [20] and quantum magnets [21,22]. Probing correlations in these phases is crucial to understand their microscopic properties, necessitating the development of new experimental techniques. Here we use quantum gas microscopy [23] to measure the site-resolved dynamics of quantum correlations in a gas of polar molecules in a two-dimensional optical lattice. Using two rotational states of the molecules, we realize a spin-1/2 system where the particles are coupled via dipolar interactions, producing a quantum spin-exchange model [21,22,24,25]. Starting with the synthetic spin system prepared far from equilibrium, we study the evolution of correlations during the thermalization process for both spatially isotropic and anisotropic interactions. Furthermore, we study the correlation dynamics in a spin-anisotropic Heisenberg model engineered from the native spin-exchange model using Floquet techniques [26][27][28]. These experiments push the frontier of probing and controlling interacting systems of ultracold molecules, with prospects for exploring new regimes of quantum matter and characterizing entangled states useful for quantum computation [29,30] and metrology [31].

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“…This discovery led Glauber to lay the foundation of quantum optics by developing the quantum theory of coherence [2] and found practical application in astronomy to measure the angular diameter of stars. [3] Since then, the HBT interferometry has been deeply explored with various sources, such as interacting photons in a nonlinear medium [4] and twisted light, [5] and has attracted significant interest beyond photons, including electrons (anti-bunching effect for fermions), [6,7] atoms, [8][9][10] molecules, [11] matter wave, [12] and phonons. [13] In contrast to the thermal source, the high-order coherence of quantum light unveils remarkable statistical behaviors among quantum particles.…”

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confidence: 99%

Manipulating the Spatial Structure of Second-Order Quantum Coherence Using Entangled Photons

Huang 黄,

Gao 高,

Ren 任

et al. 2024

Chinese Phys. Lett.

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High-order quantum coherence reveals the statistical correlation of quantum particles. Manipulation of quantum coherence of light in the temporal domain enables the production of the single-photon source, which has become one of the most important quantum resources. High-order quantum coherence in the spatial domain plays a crucial role in a variety of applications, such as quantum imaging, holography, and microscopy. However, the active control of second-order spatial quantum coherence remains a challenging task. Here we predict theoretically and demonstrate experimentally the first active manipulation of second-order spatial quantum coherence, which exhibits the capability of switching between bunching and anti-bunching, by mapping the entanglement of spatially structured photons. We also show that signal processing based on quantum coherence exhibits robust resistance to intensity disturbance. Our findings not only enhance existing applications but also pave the way for broader utilization of higher-order spatial quantum coherence.

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Observation of the Hanbury Brown–Twiss effect with ultracold molecules

Cited by 18 publications

References 45 publications

A comparative study of deconvolution techniques for quantum-gas microscope images

A comparative study of deconvolution techniques for quantum-gas microscope images

Probing site-resolved correlations in a spin system of ultracold molecules

Manipulating the Spatial Structure of Second-Order Quantum Coherence Using Entangled Photons

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