Suppressing the Loss of Ultracold Molecules Via the Continuous Quantum Zeno Effect

Zhu, Bihui; Gadway, Bryce; Foss‐Feig, Michael; Schachenmayer, Johannes; Wall, Michael L.; Hazzard, Kaden R. A.; Yan, Bo; Moses, Steven; Covey, Jacob P.; Jin, D. S.; Ye, Jun; Holland, Murray; Rey, Ana María

doi:10.1103/physrevlett.112.070404

Cited by 163 publications

(160 citation statements)

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“…3e, iii). This continuous quantum Zeno suppression was observed first in homonuclear Rb 2 Feshbach molecules [70] and more recently with an incoherent mixture of two rotational states in KRb [71,72].…”

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confidence: 99%

“…(iii) Distinguishable molecules can occupy the same lattice site and chemically react with no centrifugal energy barrier. However, if the chemical reaction rate Γ is much larger than the tunneling rate J, the quantum Zeno effect suppresses the chemical reactions [72]. f, Even for molecules that are chemically stable to two-body chemical reactions, such as NaRb, there is another predicted loss mechanism due to "sticky" collisions (see text).…”

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New frontiers for quantum gases of polar molecules

et al. 2016

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The field of ultracold quantum matter has burgeoned over the last few decades, thanks to the growing capabilities for atomic systems to be probed and manipulated with exquisite control. Researchers can now precisely create and study quantum manybody states that are effectively isolated from the external environment. Much of the work in ultracold matter has focused on systems of alkali or alkaline-earth atoms, mainly due to their ease of cooling. Extending this precise control to molecules has seen rapidly increasing interest and activity, as molecules possess additional degrees of freedom that make them useful for tests of fundamental physics, studying ultracold chemistry and collisions, and engineering qualitatively new types of quantum phases and quantum many-body systems. Here, we review one particularly fruitful research direction: the creation and manipulation of ultracold bialkali molecules. The recent success in creating a quantum gas of polar molecules opens many exciting research opportunities. Atomic, Molecular, and Optical (AMO) systems offer experimentalists the ability to precisely control interactions in a quantum many-body system [1,2], and a rich set of experiments has already been performed. Some prominent examples include studies of the BEC-BCS crossover in two-component Fermi gases [3,4,5] and the superfluid-Mott insulator transition in ultracold bosons loaded into a 3D optical lattice [6]. Neutral atomic systems normally have point-like contact interactions that can be parametrized with a single quantity, the scattering length a, which can be tuned via a Feshbach resonance [2]. In recent years, systems with long-range and anisotropic interactions have garnered much attention. One natural example is the dipolar interaction between polar molecules, which is the focus of this Review. Of course, many other experimental platforms are also being pursued that feature long-range interactions, including highly magnetic atoms [7,8], trapped ions The dipolar interaction exhibits several important attributes. First, the energy scales in dipolar systems are usually much larger than those in typical atomic alkali systems, making it easier to study interaction-driven structural properties and non-equilibrium dynamics. Second, and perhaps more importantly, the anisotropic and long-range nature of the interaction allows for the realization of novel quantum phases, especially when the spatial dimensions of the system can be varied with optical lattices. Some of these engineered systems may find relevance to outstanding problems in condensed-matter physics [13,14]; moreover, qualitatively new types of physics can emerge in the presence of long-range interactions [15,16,17,18,19,20,21]. As a specific example of a unique feature of long-range interactions, a spin-1/2 Hamiltonian can be encoded based on a pair of oppositeparity rotational states where dipolar interactions give rise to a direct spin exchange coupling between molecules [22,23]. With this scheme implemented in an optical lattice, many-body spin dynam...

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New frontiers for quantum gases of polar molecules

et al. 2016

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“…At the interface between atomic, molecular, optical, and condensed-matter physics, systems of ultracold polar molecules [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] have caused a great deal of excitement and opened a path for the quantum simulation [21][22][23][24][25][26][27][28][29] of quantum magnetism [30][31][32][33][34][35][36][37][38] and superconductivity [39,40] on optical lattices [41,42]. Intrinsic to these systems are the long-range dipolar-type interactions, which, in contrast to the long-range Coulomb interaction in condensed-matter systems, are not affected by screening.…”

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Correlations and enlarged superconducting phase of t−J⊥ chains of ultracold molecules on optical lattices

Manmana¹,

Möller²,

Gezzi³

et al. 2017

Phys. Rev. A

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We compute physical properties across the phase diagram of the t-J ⊥ chain with long-range dipolar interactions, which describe ultracold polar molecules on optical lattices. Our results obtained by the density-matrix renormalization group indicate that superconductivity is enhanced when the Ising component J z of the spin-spin interaction and the charge component V are tuned to zero and even further by the long-range dipolar interactions. At low densities, a substantially larger spin gap is obtained. We provide evidence that long-range interactions lead to algebraically decaying correlation functions despite the presence of a gap. Although this has recently been observed in other long-range interacting spin and fermion models, the correlations in our case have the peculiar property of having a small and continuously varying exponent. We construct simple analytic models and arguments to understand the most salient features.

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“…The scaling arises because, as the lattice filling f ∝ N increases, the mean distance between molecules decreases as R ∼ f −1=3 , leading to an average dipolar interaction that scales as 1=R 3 ∼ f. We indeed see an approximate scaling τ ∝ 1=N, as well as a factor of 2 reduction in coherence time for the j1; 0i data compared to the j1; −1i data. We note that the theory here uses a peak filling of f ¼ 8% for a molecule number of N ¼ 2 × 10 4 , which is within a factor of 2 of estimates based on loss measurements (∼9% for N ∼ 1 × 10 4 ) and direct imaging [15,33]. Finally, the oscillation amplitude increases with N for the experimental fillings studied since the probability of a molecule having an occupied nearest neighbor site increases with N. To characterize the amplitude of the oscillations, we plot in Fig.…”

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confidence: 99%