Site-resolved imaging of single atoms with a Faraday quantum gas microscope

Yamamoto, Ryuta; Kobayashi, Jun; Kato, Keita; Kuno, Takuma; Sakura, Yuto; Takahashi, Yoshiro

doi:10.1103/physreva.96.033610

Cited by 33 publications

(31 citation statements)

References 51 publications

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“…Before going to our proposal schemes for nondestructive imaging, we discuss the limitation of quantum gas microscopy with a dispersive Faraday interaction. Figure 1(a) shows the schematic setup [27]. We assume the transition =  = J J 0 1 g e for probing the atoms for simplicity, as shown in figure 1(b).…”

Section: Limitation Of Dispersive Qgmmentioning

confidence: 99%

“…The polarization rotation signal for a single atom can be understood as an effect of interference between a linearly polarized input probe beam ( )  E r probe and an elastically scattered electric field coherently induced by a single atom. Based on diffraction theory [28] and scattering theory [29], the scattered light field ( )  E r sc is described [27] as ⎛…”

Section: Limitation Of Dispersive Qgmmentioning

confidence: 99%

“…(a) Schematics of Faraday imaging of single atoms in an optical lattice[27]. Off-resonant linearly polarized probe light induces an elastically scattered coherent light field with the polarization orthogonal to that of the probe beam in the presence of a bias magnetic field B 0 .…”

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confidence: 99%

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Schemes for nondestructive quantum gas microscopy of single atoms in an optical lattice

et al. 2020

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We propose a quantum gas microscope for ultracold atoms that enables nondestructive atom detection, thus evading higher-band excitation and change of the internal degrees of freedom. We show that photon absorption of a probe beam cannot be ignored even in dispersive detection to obtain a signal-to-noise ratio greater than unity because of the shot noise of the probe beam under a standard measurement condition. The first scheme we consider for the nondestructive detection, applicable to an atom that has an electronic ground state without spin degrees of freedom, is to utilize a magicwavelength condition of the optical lattice for the transition for probing. The second is based on the dispersive Faraday effect and squeezed quantum noise and is applicable to an atom with spins in the ground state. In this second scheme, a scanning microscope is adopted to exploit the squeezed state and reduce the effective losses. Application to ultracold ytterbium atoms is discussed.

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Section: Limitation Of Dispersive Qgmmentioning

confidence: 99%

Section: Limitation Of Dispersive Qgmmentioning

confidence: 99%

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Schemes for nondestructive quantum gas microscopy of single atoms in an optical lattice

et al. 2020

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“…In table 1, we see that the particle number variances differ strongly for the three states, allowing for a clear assignment and identification. Therefore, n i 2 D ( ) can be exploited as an experimental signature for the different states and thus also for correlations, since it is accessible via quantum gas microscopy [58,59].…”

Section: State Characterizationmentioning

confidence: 99%

Correlation induced localization of lattice trapped bosons coupled to a Bose–Einstein condensate

2018

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We investigate the ground state properties of a lattice trapped bosonic system coupled to a Lieb-Liniger type gas. Our main goal is the description and in depth exploration and analysis of the twospecies many-body quantum system including all relevant correlations beyond the standard meanfield approach. To achieve this, we use the multi-configuration time-dependent Hartree method for mixtures (ML-MCTDHX). Increasing the lattice depth and the interspecies interaction strength, the wave function undergoes a transition from an uncorrelated to a highly correlated state, which manifests itself in the localization of the lattice atoms in the latter regime. For small interspecies couplings, we identify the process responsible for this cross-over in a single-particle-like picture. Moreover, we give a full characterization of the wave function's structure in both regimes, using Bloch and Wannier states of the lowest band, and we find an order parameter, which can be exploited as a corresponding experimental signature. To deepen the understanding, we use an effective Hamiltonian approach, which introduces an induced interaction and is valid for small interspecies interaction. We finally compare the ansatz of the effective Hamiltonian with the results of the ML-MCTDHX simulations. through the bath [17] and correlation effects due to the entanglement of the species [18]. In particular, 1D impurity-bath systems exhibit large interaction effects, bringing to light many peculiar phenomena [19][20][21][22][23]. In addition, impurities in Bose-Einstein condensates (BECs) can be exploited as a quantum simulator for polaron physics [25,24,26]. One of the first theoretical descriptions of polarons, including phonon clouds, was introduced by Fröhlich [27]. Since then a lot of progress has been made in the limiting cases of weak [28,29] and strong electron-phonon coupling [30]. While the ongoing theoretical study of 1D polarons [31][32][33][34][35] has predicted a lot of intriguing properties, recent experiments [17,23,36,37] have finally opened the door to the implementation of 1D polaronic systems, providing a deeper understanding of 1D polarons. When immersing more than one impurity in the bath, an induced interaction among the polarons appears, which counteracts the repulsive interaction among the impurities. The description in terms of polarons is in general of major interest for the understanding of the electron-phonon coupling in condensed matter physics. In order to manipulate impurities in a controlled, systematic way in ultracold physics, it would be useful to load the impurities first in a lattice, which is in turn inserted into the bath, since lattices allow for single-site excitation as well as collective excitations. To some extent, such a setup has been investigated in the tight-binding limit recently [38][39][40], where the authors especially focussed on the behavior of the combined systems under the influence of increasing temperature, e.g. the clustering of polarons in the wells of the lattice due to an attractive in...

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“…Such feedback control will be enabled if nondemolition measurement of local spin states with single-site resolution is realized 57 . After time-evolution with t 0 = π/[8(E t − E s )], the state is written as…”

Section: S5 Preparing the Singlet State At Edgesmentioning

confidence: 99%

Reduction of Topological Z Classification in Cold-Atom Systems

et al. 2018

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One of the most challenging problems in correlated topological systems is a realization of the reduction of topological classification, but very few experimental platforms have been proposed so far. We here demonstrate that ultracold dipolar fermions (e.g., ^{167}Er, ^{161}Dy, and ^{53}Cr) loaded in an optical lattice of two-leg ladder geometry can be the first promising test bed for the reduction Z→Z_{4}, where solid evidence for the reduction is available thanks to their high controllability. We further give a detailed account of how to experimentally access this phenomenon; around the edges, the destruction of one-particle gapless excitations can be observed by the local radio frequency spectroscopy, while that of gapless spin excitations can be observed by a time-dependent spin expectation value of a superposed state of the ground state and the first excited state. We clarify that even when the reduction occurs, a gapless edge mode is recovered around a dislocation, which can be another piece of evidence for the reduction.

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Site-resolved imaging of single atoms with a Faraday quantum gas microscope

Cited by 33 publications

References 51 publications

Schemes for nondestructive quantum gas microscopy of single atoms in an optical lattice

Schemes for nondestructive quantum gas microscopy of single atoms in an optical lattice

Correlation induced localization of lattice trapped bosons coupled to a Bose–Einstein condensate

Reduction of Topological Z Classification in Cold-Atom Systems

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