High precision differential clock comparisons with a multiplexed optical lattice clock

Zheng, Xin; Dolde, Jonathan; Lochab, Varun; Merriman, Brett N.; Li, Haoran; Kolkowitz, Shimon

doi:10.48550/arxiv.2109.12237

Cited by 4 publications

(4 citation statements)

References 59 publications

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“…Entanglement transport could also find use in metrological applications such as creating distributed states for probing gravitational gradients [53]. Finally, our approach can help facilitate quantum networking between separated arrays, paving the way toward large-scale quantum information systems [29,54] and distributed quantum metrology [53,55].…”

Section: Discussion and Outlookmentioning

confidence: 97%

A quantum processor based on coherent transport of entangled atom arrays

Bluvstein,

Levine,

Semeghini

et al. 2021

Preprint

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The ability to engineer parallel, programmable operations between desired qubits within a quantum processor is central for building scalable quantum information systems [1,2]. In most stateof-the-art approaches, qubits interact locally, constrained by the connectivity associated with their fixed spatial layout. Here, we demonstrate a quantum processor with dynamic, nonlocal connectivity, in which entangled qubits are coherently transported in a highly parallel manner across two spatial dimensions, in between layers of single-and two-qubit operations. Our approach makes use of neutral atom arrays trapped and transported by optical tweezers; hyperfine states are used for robust quantum information storage, and excitation into Rydberg states is used for entanglement generation [3][4][5]. We use this architecture to realize programmable generation of entangled graph states such as cluster states and a 7-qubit Steane code state [6,7]. Furthermore, we shuttle entangled ancilla arrays to realize a surface code with 19 qubits [8] and a toric code state on a torus with 24 qubits [9]. Finally, we use this architecture to realize a hybrid analog-digital evolution [2] and employ it for measuring entanglement entropy in quantum simulations [10][11][12], experimentally observing non-monotonic entanglement dynamics associated with quantum many-body scars [13,14]. Realizing a long-standing goal, these results pave the way toward scalable quantum processing and enable new applications ranging from simulation to metrology.

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Section: Discussion and Outlookmentioning

confidence: 97%

A quantum processor based on coherent transport of entangled atom arrays

Bluvstein,

Levine,

Semeghini

et al. 2021

Preprint

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show abstract

“…The development of laboratory atomic clocks is fuelled by a broad community that spans universities, industry and several National Metrology Institutes. Optical lattice clocks are now particularly widespread, with more than a dozen strontium (Sr) [62,74,88,[91][92][93][94][95][96][97][98][99][100][101] and some ytterbium (Yb) ) and optical lattice clocks (Sr [77], Yb [76], Hg [75], Cd [83]). [101][102][103][104][105] clock laboratories in operation worldwide.…”

Section: Laboratory-based Clocksmentioning

confidence: 99%

Cold Atoms in Space: Community Workshop Summary and Proposed Road-Map

Alonso,

Alpigiani,

Altschul

et al. 2022

Preprint

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We summarize the discussions at a virtual Community Workshop on Cold Atoms in Space concerning the status of cold atom technologies, the prospective scientific and societal opportunities offered by their deployment in space, and the developments needed before cold atoms could be operated in space. The cold atom technologies discussed include atomic clocks, quantum gravimeters and accelerometers, and atom interferometers. Prospective applications include metrology, geodesy and measurement of terrestrial mass change due to, e.g., climate change, and fundamental science experiments such as tests of the equivalence principle, searches for dark matter, measurements of gravitational waves and tests of quantum mechanics. We review the current status of cold atom technologies and outline the requirements for their space qualification, including the development paths and the corresponding technical milestones, and identifying possible pathfinder missions to pave the way for missions to exploit the full potential of cold atoms in space. Finally, we present a first draft of a possible roadmap for achieving these goals, that we propose for discussion by the interested cold atom, Earth Observation, fundamental physics and other prospective scientific user communities, together with ESA and national space and research funding agencies. research areas. As anticipated for a Europe-based event, about 80% of the registrations are from European countries, as seen in the lower right panel of Fig. 1, but there is also significant North American and Asian participation.This community provides the backbone for long-term planning and the support needed to see the challenging cold atom missions foreseen in the road-map through to their successful completions. The participants display an excellent and diverse mix of expertise, building an outstanding basis for the success of the workshop and the development of the corresponding road-map, which defines possible interim and long-term scientific goals and outlines technological milestones. Section 2 is an introduction to our document, Sections 3 to 5 discuss our main science themes, namely atomic clocks, Earth Observation and fundamental physics, Section 6 discusses the technology developments required before quantum sensors can be deployed in space, Section 7 summarises the discussions during the Workshop, and in Section 8 we outline the corresponding Community road-map.

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“…For such approaches, the next advances are already planned: satellite-based experiments that will allow researchers to improve the accuracy by orders of magnitude [44,45]. Recent developments with optical lattice clocks also showed that resolving the gravitational redshift within a single sample on a submillimeter scale is possible [46,47]. Specifically, a change of frequency consistent with the linear gravitational field was measured along the system consisting of 100,000 strontium atoms [46].…”

Section: Discussionmentioning

confidence: 99%

Quantum time dilation in a gravitational field

Paczos¹,

Dębski²,

Grochowski³

et al. 2022

Preprint

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According to relativity, the reading of an ideal clock is interpreted as the elapsed proper time along its single classical trajectory. In contrast, quantum theory allows the association of many simultaneous paths with a single quantum clock. Here, we investigate how the superposition principle affects the gravitational time dilation observed by a simple clock-a decaying two-level atom. Placing such an atom in a superposition of positions enables us to analyze a quantum contribution to a classical time dilation, manifested in the process of spontaneous emission. In particular, we show that the emission rate of an atom prepared in a coherent superposition of separated wave packets in a gravitational field is different from the transition rate of the atom in a classical mixture of these packets, which gives rise to a nonclassical-gravitational time dilation effect. In addition, we show the effect of spatial coherence on the atom's emission spectrum.

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High precision differential clock comparisons with a multiplexed optical lattice clock

Cited by 4 publications

References 59 publications

A quantum processor based on coherent transport of entangled atom arrays

A quantum processor based on coherent transport of entangled atom arrays

Cold Atoms in Space: Community Workshop Summary and Proposed Road-Map

Quantum time dilation in a gravitational field

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