Coherent and dissipative dynamics of entangled few-body systems of Rydberg atoms

Lee, Woojun; Kim, Minhyuk; Jo, Hanlae; Song, Yunheung; Ahn, Jaewook

doi:10.1103/physreva.99.043404

Cited by 45 publications

(27 citation statements)

References 42 publications

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“…The atomic temperature T a is assumed to change within the range of T a ∈ [0, 50] µK for a cryogenic environment. We note that similar magnitudes of an atomic temperature have been reached experimentally [61][62][63].…”

Section: B Technical Errorssupporting

confidence: 84%

Optimal model for fewer-qubit CNOT gates with Rydberg atoms

Li¹,

Li²,

Yu³

et al. 2021

Preprint

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Fewer-qubit quantum logic gate, serving as a basic unit for constructing universal multiqubit gates, has been widely applied in quantum computing and quantum information. However, traditional constructions for fewer-qubit gates often utilize a multi-pulse protocol which inevitably suffers from serious intrinsic errors during the gate execution. In this article, we report an optimal model about universal two-and three-qubit CNOT gates mediated by excitation to Rydberg states with easily-accessible van der Waals interactions. This gate depends on a global optimization to implement amplitude and phase modulated pulses via genetic algorithm, which can facilitate the gate operation with fewer optical pulses. Compared to conventional multi-pulse piecewise schemes, our gate can be realized by simultaneous excitation of atoms to the Rydberg states, saving the time for multi-pulse switching at different spatial locations. Our numerical simulations show that a single-pulse two(three)-qubit CNOT gate is possibly achieved with a fidelity of 99.23%(90.39%) for two qubits separated by 7.10 µm when the fluctuation of Rydberg interactions is excluded. Our work is promising for achieving fast and convenient multiqubit quantum computing in the study of neutral-atom quantum technology.

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Section: B Technical Errorssupporting

confidence: 84%

Optimal model for fewer-qubit CNOT gates with Rydberg atoms

Li¹,

Li²,

Yu³

et al. 2021

Preprint

View full text Add to dashboard Cite

show abstract

“…So, the resulting fringe visibility, cos(α/2), manifests the entanglement: maximal (minimal) visibility for no (maximal) entanglement. Experiments were performed with an apparatus previously reported elsewhere [4,21,22]. In brief, we used optical tweezers to trap rubidium ( 87 Rb) single atoms and, with a 2-ms optical pumping, prepared them in the ground state |0 = |5S 1/2 , F = 2, m F = 2 .…”

mentioning

confidence: 99%

Rydberg Atom Entanglements in the Weak Coupling Regime

Song

Kim

et al. 2020

Phys. Rev. Lett.

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We present an entanglement scheme for Rydberg atoms using the van der Waals interaction phase induced by Ramsey-type pulsed interactions. This scheme realizes not only controlled phase operations between atoms at a distance larger than Rydberg blockade distance, but also various counter-intuitive entanglement examples, including two-atom entanglement in the presence of a closer third atom and W -state generation for partially-blockaded three atoms. Experimental realization is conducted with single rubidium atoms loaded in an array of optical tweezer dipole traps, to demonstrate the proposed entanglement generations and measurements.

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“…The laser phase noise can be directly written as Ω i (t) = Ω i exp(iϕ i (t)), where ϕ i (t) presents as a random process related to the power spectral density S ϕ (f ) with phase-modulated Fourier frequency f . Because S ϕ (f ) depends on the test results of specific experiments, the laser phase noise is difficult to quantify directly [99,100]. But the average result of the laser phase noise will lead to dephasing of Rabi oscillations [96].…”

Section: Fluctuation and Noise Of External Fieldsmentioning

confidence: 99%

Single Gaussian temporal pulse modulated controlled-Z gate of neutral atoms under symmetrically optical pumping

Li¹,

Shao²,

Li³

2022

Preprint

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We propose an experimentally feasible protocol for implementing the standard controlled-Z gate of neutral atoms through a symmetrical two-photon excitation process via the second resonance line, 6P in 87 Rb, with a single-Gaussian-temporal-modulation-coupling of ground state and intermediate state. For qubit states that encoded on the alkali clock states, the dynamics of system depend on different adiabatic paths modulated by Gaussian pulses, which accumulates a phase factor of π on logic qubit state |11 alone at the end of the operation. The Gaussian pulse takes the simple form of Ω0 exp[−(t − 2T ) 2 /T 2 ], and the corresponding optimal parameters can be easily determined by direct use of numerical integration. On the premise of considering only spontaneous emission, the gate fidelity can achieve 99.78% with the operation time less than 1 µs. Furthermore, we discuss in detail the impact of other sources of errors on the fidelity of logic gate and find that the use of adiabatic pulse makes the gate less sensitive to the Doppler effect and laser intensity fluctuation. By selecting suitable optical traps, the predicted fidelity of the gate can reach about 98.4% after correcting the measurement error. Compared with the existing schemes, we achieve a higher fidelity quantum logic gate through a simpler Gaussian driving field, which may be helpful to the experimental implementation of quantum computation and quantum simulation in the neutral-atoms system.

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Coherent and dissipative dynamics of entangled few-body systems of Rydberg atoms

Cited by 45 publications

References 42 publications

Optimal model for fewer-qubit CNOT gates with Rydberg atoms

Optimal model for fewer-qubit CNOT gates with Rydberg atoms

Rydberg Atom Entanglements in the Weak Coupling Regime

Single Gaussian temporal pulse modulated controlled-Z gate of neutral atoms under symmetrically optical pumping

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