Fast transport, atom sample splitting and single-atom qubit supply in two-dimensional arrays of optical microtraps

Schlosser, Malte; Kruse, Jens; Gierl, Christian; Teichmann, Stephan; Tichelmann, Sascha; Birkl, G.

doi:10.1088/1367-2630/14/12/123034

Cited by 27 publications

(33 citation statements)

References 49 publications

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“…In an experiment a macroscopic atomic cloud was divided into two reservoirs separated by a narrow channel by the use of a laser beam [12], thus creating a cold-atom analog of a mesoscopic conductor. Recent advances in the manipulation of cold atoms loaded in optical lattices are presented in [13]. Decreasing the dimensionality of the tunneling to zero, a new field is investigated -the atomtronics.…”

Section: Introductionmentioning

confidence: 99%

Bosonic transport through a chain of quantum dots

et al. 2013

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The particle transport through a chain of quantum dots coupled to two bosonic reservoirs is studied. For the case of reservoirs of non-interacting bosonic particles, we derive an exact set of stochastic differential equations, whose memory kernels and driving noise are characterised entirely by the properties of the reservoirs. Going to the Markovian limit an analytically solvable case is presented. The effect of interparticle interactions on the transient behaviour of the system, when both reservoirs are instantaneously coupled to an empty chain of quantum dots, is approximated by a semiclassical method, known as the Truncated Wigner approximation. The steady-state particle flow through the chain and the mean particle occupations are explained via the spectral properties of the interacting system.

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Section: Introductionmentioning

confidence: 99%

Bosonic transport through a chain of quantum dots

et al. 2013

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“…In a 'top-down' approach using optical lattices and quantum gas microscopes, hundreds of traps can now be created and addressed individually [8]. By making use of the superfluid to Mott-insulator transition, single atom filling fractions exceeding 90% are achieved [9], albeit at the expense of relatively long experimental duty cycles and constraints in the lattice geometries.Single atoms can also be trapped in 2d arrays of microscopic optical tweezers with single-site resolution using holographic methods [10][11][12]. This bottom-up approach offers faster preparation and a higher degree of tunability of the underlying geometry.…”

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confidence: 99%

An atom-by-atom assembler of defect-free arbitrary two-dimensional atomic arrays

Barredo

Léséleuc

Lienhard

et al. 2016

Science

804

705

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Large arrays of individually controlled atoms trapped in optical tweezers are a very promising platform for quantum engineering applications. However, to date, only disordered arrays have been demonstrated, due to the non-deterministic loading of the traps. Here, we demonstrate the preparation of fully loaded, two-dimensional arrays of up to ∼ 50 microtraps each containing a single atom, and arranged in arbitrary geometries. Starting from initially larger, half-filled matrices of randomly loaded traps, we obtain user-defined target arrays at unit filling. This is achieved with a real-time control system and a moving optical tweezers that performs a sequence of rapid atom moves depending on the initial distribution of the atoms in the arrays. These results open exciting prospects for quantum engineering with neutral atoms in tunable geometries.The last decade has seen tremendous progress over the control of individual quantum objects [1, 2]. Many experimental platforms, from trapped ions [3] to superconducting qubits [4], are actively explored. The current challenge is now to extend these results towards large assemblies of such objects, while keeping the same degree of control, in view of applications in quantum information processing [5], quantum metrology [6], or quantum simulation [7]. Neutral atoms offer some advantages over other systems for these tasks. Besides being well isolated from the environment and having tunable interactions, systems of cold atoms hold the promise of being scalable to hundreds of individually controlled qubits. Control of the atomic positions at the single-particle level can been achieved with optical potentials. In a 'top-down' approach using optical lattices and quantum gas microscopes, hundreds of traps can now be created and addressed individually [8]. By making use of the superfluid to Mott-insulator transition, single atom filling fractions exceeding 90% are achieved [9], albeit at the expense of relatively long experimental duty cycles and constraints in the lattice geometries.Single atoms can also be trapped in 2d arrays of microscopic optical tweezers with single-site resolution using holographic methods [10][11][12]. This bottom-up approach offers faster preparation and a higher degree of tunability of the underlying geometry. However, achieving unit filling of the arrays is hampered by the stochastic nature of the loading and has remained so far elusive. Although proof-of-principle demonstrations of quantum gates [13] and quantum simulations [14] using this latter platform have been reported [15], this non-deterministic loading poses a serious limitation for applications where large-scale ordered arrays are required. To solve this problem, several approaches have been considered, exploiting the Rydberg blockade mechanism [16], or using tailored light-assisted collisions [17]. To date, despite those efforts, loading efficiencies of around 90% at best for a single atom in a single tweezers could be achieved [18,19], making the probabilities to fully load large arrays still...

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“…We use optical microtraps to directly extract individual atoms from a laser-cooled cloud [10][11][12] and employ recently demonstrated trapping techniques [13][14][15][16][17] and single-atom position control [18][19][20][21][22] to create desired atomic configurations. Central to our approach is the use of single-atom detection and real-time feedback [18,21,22] to eliminate the entropy associated with the probabilistic trap occupation [11] (currently limited to ninety percent even with advanced loading techniques [23][24][25]).…”

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confidence: 99%

Atom-by-atom assembly of defect-free one-dimensional cold atom arrays

Endres

Bernien

Keesling

et al. 2016

Science

820

689

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The realization of large-scale fully controllable quantum systems is an exciting frontier in modern physical science. We use atom-by-atom assembly to implement a novel platform for the deterministic preparation of regular arrays of individually controlled cold atoms. In our approach, a measurement and feedback procedure eliminates the entropy associated with probabilistic trap occupation and results in defect-free arrays of over 50 atoms in less than 400 ms. The technique is based on fast, realtime control of 100 optical tweezers, which we use to arrange atoms in desired geometric patterns and to maintain these configurations by replacing lost atoms with surplus atoms from a reservoir. This bottom-up approach enables controlled engineering of scalable many-body systems for quantum information processing, quantum simulations, and precision measurements.The detection and manipulation of individual quantum particles, such as atoms or photons, is now routinely performed in many quantum physics experiments [1,2]; however, retaining the same control in large-scale systems remains an outstanding challenge. For example, major efforts are currently aimed at scaling up ion-trap and superconducting platforms, where high-fidelity quantum computing operations have been demonstrated in registers consisting of several qubits [3,4]. In contrast, ultracold quantum gases composed of neutral atoms offer inherently large system sizes. However, arbitrary single atom control is highly demanding and its realization is further limited by the slow evaporative cooling process necessary to reach quantum degeneracy. Only in recent years has individual particle detection [5,6] and basic single-spin control [7] been demonstrated in low entropy optical lattice systems.This Report demonstrates a novel approach for rapidly creating scalable quantum matter with inherent single particle control via atom-by-atom assembly of large defect-free arrays of cold neutral atoms [8,9]. We use optical microtraps to directly extract individual atoms from a laser-cooled cloud [10][11][12] and employ recently demonstrated trapping techniques [13][14][15][16][17] and single-atom position control [18][19][20][21][22] to create desired atomic configurations. Central to our approach is the use of single-atom detection and real-time feedback [18,21,22] to eliminate the entropy associated with the probabilistic trap occupation [11] (currently limited to ninety percent even with advanced loading techniques [23][24][25]). Related to the fundamental concept of "Maxwell's demon" [8,9], this method allows us to rapidly create large defect-free atom arrays and to maintain them for long periods of time, providing an excellent platform for large-scale experiments based on techniques ranging from Rydberg-mediated interactions [26][27][28][29][30] to nanophotonic platforms [31,32] and Hubbard model physics [16,17,33].The experimental protocol is illustrated in Fig. 1A. The trap array is produced by an acousto-optic deflector (AOD) and imaged with a 1:1 telescope onto a 0.5 NA...

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Fast transport, atom sample splitting and single-atom qubit supply in two-dimensional arrays of optical microtraps

Cited by 27 publications

References 49 publications

Bosonic transport through a chain of quantum dots

Bosonic transport through a chain of quantum dots

An atom-by-atom assembler of defect-free arbitrary two-dimensional atomic arrays

Atom-by-atom assembly of defect-free one-dimensional cold atom arrays

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