Generation and manipulation of Schrödinger cat states in Rydberg atom arrays

Omran, Ahmed; Levine, Harry; Keesling, Alexander; Semeghini, Giulia; Wang, T. T.; Ebadi, Sepehr; Bernien, Hannes; Zibrov, A. S.; Pichler, Hannes; Choi, Soonwon; Cui, Jian; Rossignolo, Marco; Rembold, Phila; Montangero, Simone; Calarco, Tommaso; Endres, Manuel; Greiner, Markus; Vuletić, Vladan; Lukin, Mikhail D.

doi:10.1126/science.aax9743

Cited by 562 publications

(457 citation statements)

References 60 publications

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“…As shown in Fig. 2d, for a specific choice of laser detuning (∆ ≈ 0.377Ω), 2φ 01 − π = φ 11 , realizing the CZ gate (1). Remarkably, this gate protocol is faster (total time 2τ ≈ 2.732π/Ω) than the traditional approach [7] of sequential local pulses (total time 4π/Ω), and offers the additional advantage of requiring only global coupling of both qubits.…”

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confidence: 95%

“…Trapped neutral atoms are attractive building blocks for large scale quantum information systems. They can be readily manipulated in large numbers while maintaining excellent quantum coherence, as has been demonstrated in remarkable quantum simulation and precision measurement experiments [1,2]. Single atom initialization, addressing, and readout have been demonstrated in a variety of optical trapping platforms, and single-qubit gates have been implemented with exquisite fidelity [3][4][5].…”

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confidence: 99%

“…The local addressing beams are generated by an acousto-optic deflector which splits a single 420 nm laser, tuned near the 5S 1/2 to 6P 3/2 transition, into several beams focused onto individual atoms ( Fig. 1a,d) [17]. We describe these two couplings as global X(θ) qubit rotations and local Z(θ) rotations.…”

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confidence: 99%

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Parallel Implementation of High-Fidelity Multiqubit Gates with Neutral Atoms

et al. 2019

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We report the implementation of universal two-and three-qubit entangling gates on neutral atom qubits encoded in long-lived hyperfine ground states. The gates are mediated by excitation to strongly interacting Rydberg states, and are implemented in parallel on several clusters of atoms in a one-dimensional array of optical tweezers. Specifically, we realize the controlled-phase gate, enacted by a novel, fast protocol involving only global coupling of two qubits to Rydberg states. We benchmark this operation by preparing Bell states with fidelity F ≥ 95.0(2)%, and extract gate fidelity ≥ 97.4(3)%, averaged across five atom pairs. In addition, we report a proof-of-principle implementation of the three-qubit Toffoli gate, in which two control atoms simultaneously constrain the behavior of one target atom. These experiments demonstrate key ingredients for high-fidelity quantum information processing in a scalable neutral atom platform.

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confidence: 95%

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Parallel Implementation of High-Fidelity Multiqubit Gates with Neutral Atoms

et al. 2019

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“…Experimental efforts towards achieving macroscopic entanglement continue to drive significant research activity, e.g. [2][3][4][5][6][7]. For ultracold quantum gases confined to triple-well potentials, many opportunities exist for the exploration of intriguing phenomena such as transistor-like behaviours [8][9][10], coherent population transfer [11], fragmentation [12], and quantum chaos [13].…”

Section: Introductionmentioning

confidence: 99%

Entangled states of dipolar bosons generated in a triple-well potential

et al. 2020

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We study the generation of entangled states using a device constructed from dipolar bosons confined to a triple-well potential. Dipolar bosons possess controllable, long-range interactions. This property permits specific choices to be made for the coupling parameters, such that the system is integrable. Integrability assists in the analysis of the system via an effective Hamiltonian constructed through a conserved operator. Through computations of fidelity we establish that this approach, to study the time-evolution of the entanglement for a class of non-entangled initial states, yields accurate approximations given by analytic formulae.

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“…Especially, Greenberger-Horne-Zeilinger (GHZ) states can be used to outperform the standard quantum limit that classical sensors cannot surpass [12,[32][33][34][35][36][37][38][39][40][41][42]. There are many experimental demonstration * hakoshima-hideaki@aist.go.jp † matsuzaki.yuichiro@aist.go.jp to generate the GHZ states with several systems [12,[43][44][45].…”

Section: Introductionmentioning

confidence: 99%

Single spin detection with entangled states

Hakoshima

Matsuzaki

2020

Jpn. J. Appl. Phys.

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Single spin detection is one of the important tasks in the field of quantum metrology. Many experiments about the single spin detection has been performed. However, due to the weak magnetic fields from the single spin, a long measurement time is required to achieve a reasonably high signalto-noise ratio. Here, we propose an alternative way to realize rapid and accurate single spin detection with entangled states. While it is known that entanglement can improve the sensitivity to measure globally applied magnetic fields, we investigate a strategy to use the entanglement for detecting spatially inhomogeneous magnetic fields from the target single spin. We show that the entanglement significantly increases the signal to noise ratio for the single spin detection even under the effect of realistic noise. Our results pave the way for practical single spin detection.

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Generation and manipulation of Schrödinger cat states in Rydberg atom arrays

Cited by 562 publications

References 60 publications

Parallel Implementation of High-Fidelity Multiqubit Gates with Neutral Atoms

Parallel Implementation of High-Fidelity Multiqubit Gates with Neutral Atoms

Entangled states of dipolar bosons generated in a triple-well potential

Single spin detection with entangled states

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