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A quantum processor based on coherent transport of entangled atom arrays
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Journal Article
A quantum processor based on coherent transport of entangled atom arrays
2022
Overview
The ability to engineer parallel, programmable operations between desired qubits within a quantum processor is key for building scalable quantum information systems
1
,
2
. In most state-of-the-art approaches, qubits interact locally, constrained by the connectivity associated with their fixed spatial layout. Here we demonstrate a quantum processor with dynamic, non-local connectivity, in which entangled qubits are coherently transported in a highly parallel manner across two spatial dimensions, 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
–
5
. We use this architecture to realize programmable generation of entangled graph states, such as cluster states and a seven-qubit Steane code state
6
,
7
. Furthermore, we shuttle entangled ancilla arrays to realize a surface code state with thirteen data and six ancillary qubits
8
and a toric code state on a torus with sixteen data and eight ancillary qubits
9
. Finally, we use this architecture to realize a hybrid analogue–digital evolution
2
and use it for measuring entanglement entropy in quantum simulations
10
–
12
, experimentally observing non-monotonic entanglement dynamics associated with quantum many-body scars
13
,
14
. Realizing a long-standing goal, these results provide a route towards scalable quantum processing and enable applications ranging from simulation to metrology.
A quantum processer is realized using arrays of neutral atoms that are transported in a parallel manner by optical tweezers during computations, and used for quantum error correction and simulations.
Publisher
Nature Publishing Group UK,Nature Publishing Group
