Preparation of one <sup>87</sup>Rb and one <sup>133</sup>Cs atom in a single optical tweezer

Brooks, R. V.; Spence, Stefan; Guttridge, Alexander; Alampounti, Alexandros; Rakonjac, Ana; McArd, Lewis A.; Hutson, Jeremy M.; Cornish, Simon L.

doi:10.1088/1367-2630/ac0000

Cited by 24 publications

(27 citation statements)

References 94 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: 85%

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: 85%

Optimal model for fewer-qubit CNOT gates with Rydberg atoms

Li¹,

Li²,

Yu³

et al. 2021

Preprint

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“…Another more important reason is that the atomic cooling and trapping scales of MOT vary from several hundred microns to several millimeters much larger than the Rydberg blocking radius. Therefore, in the experiment, the neutral atom is loaded into a far resonance optical trap (FORT) [52,56] or an optical tweezer [91][92][93] via MOT to achieve further capture. The optical dipole trap is based on the so-called dipole force.…”

Section: Discussion Of the Experimental Feasibility And Technical Imp...mentioning

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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“…This optical tweezer array is formed by combining a 2D array of tweezers at 910 nm generated from a spatial-light modulator (SLM) and a separate 2D array of tweezers at 811 nm generated from an acoustooptic deflector (AOD). The wavelengths and laser intensities are chosen such that the 910 nm tweezers and the 811 nm tweezers are element-selective for single Cs and Rb atoms, respectively [31]. Control of the phase pattern on the SLM and of the radio-frequency (RF) tones sent to the AOD enables flexible arrangement of the positions of each optical tweezer, allowing us to create arbitrary 2D geometries of Rb and Cs atoms.…”

Section: Dual-element Atom Arraymentioning

confidence: 99%

A dual-element, two-dimensional atom array with continuous-mode operation

Singh,

Anand,

Pocklington

et al. 2021

Preprint

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Quantum processing architectures that include multiple qubit modalities offer compelling strategies for high-fidelity operations and readout, quantum error correction, and a path for scaling to large system sizes. Such hybrid architectures have been realized for leading platforms, including superconducting circuits and trapped ions. Recently, a new approach for constructing large, coherent quantum processors has emerged based on arrays of individually trapped neutral atoms. However, these demonstrations have been limited to arrays of a single atomic element where the identical nature of the atoms makes crosstalk-free control and non-demolition readout of a large number of atomic qubits challenging. Here we introduce a dual-element atom array with individual control of single rubidium and cesium atoms. We demonstrate their independent placement in arrays with up to 512 trapping sites and observe negligible crosstalk between the two elements. Furthermore, by continuously reloading one atomic element while maintaining an array of the other, we demonstrate a new continuous operation mode for atom arrays without any off-time. Our results enable avenues for ancilla-assisted quantum protocols such as quantum non-demolition measurements and quantum error correction, as well as continuously operating quantum processors and sensors.

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Preparation of one ⁸⁷Rb and one ¹³³Cs atom in a single optical tweezer

Cited by 24 publications

References 94 publications

Optimal model for fewer-qubit CNOT gates with Rydberg atoms

Optimal model for fewer-qubit CNOT gates with Rydberg atoms

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

A dual-element, two-dimensional atom array with continuous-mode operation

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Preparation of one 87Rb and one 133Cs atom in a single optical tweezer

Cited by 24 publications

References 94 publications

Optimal model for fewer-qubit CNOT gates with Rydberg atoms

Optimal model for fewer-qubit CNOT gates with Rydberg atoms

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

A dual-element, two-dimensional atom array with continuous-mode operation

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Preparation of one ⁸⁷Rb and one ¹³³Cs atom in a single optical tweezer