One-step implementation of the Rydberg-Rydberg-interaction gate

Su, Shi‐Lei; Liang, Erjun; Zhang, Shou; Wen, Jiajia; Sun, Lili; Jin, Zhao; Zhu, Ai‐Dong

doi:10.1103/physreva.93.012306

Cited by 107 publications

(86 citation statements)

References 24 publications

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“…The deviation range of d keeping F > 0.99 is less than 2 nm. In fact, the extreme sensitivity to errors in the interatomic distance as well as the RRI strength is a common issue for the RAB gate schemes [13][14][15][16]. The shortcomings itemized above of implementing the CZ gate can be overcome by breaking the RAB, as shown in the next section.…”

Section: Effective Rabi Dynamics and Controlled-z Gatementioning

confidence: 99%

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Effective Rabi dynamics of Rydberg atoms and robust high-fidelity quantum gates with a resonant amplitude-modulation field

Wang

et al. 2020

Opt. Lett.

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With a resonant amplitude-modulation field on two Rydberg atoms, we propose a Rydberg antiblockade (RAB) regime, where the Rabi oscillation between collective ground and excited states is induced. A controlled-Z gate can be yielded through a Rabi cycle. Further, several common issues of the RAB gates are solved by modifying the parameter relation. The gate fidelity and the gate robustness against the control error are enhanced with a shaped pulse. The requirement of control precision of the Rydberg-Rydberg interaction strength is relaxed. In addition, the atomic excitation is restrained and therefore the gate robustness against the atomic decay is enhanced.

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Section: Effective Rabi Dynamics and Controlled-z Gatementioning

confidence: 99%

“…Alternatively, we here mainly focus on a controlled-Z (CZ) gate formed straightforwardly through a single Rabi cycle. Similar to the existing RAB schemes [1,9,[13][14][15][16][17], the implementation of this CZ gate may also encounter with the obstacles of the RAB gates.…”

Section: Introductionmentioning

confidence: 99%

Effective Rabi dynamics of Rydberg atoms and robust high-fidelity quantum gates with a resonant amplitude-modulation field

Wang

et al. 2020

Opt. Lett.

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“…In contrast to Rydberg blockade, Rydberg antiblockade (RAB) allows more than one Rydberg atom to be excited [9][10][11][12] and has also been well studied [2,[13][14][15][16][17][18][19][20][21][22] for Rydberg-atom-based preparation of quantum entangled state and construction of quantum logic gate. Conventionally, RAB can be classified as two types.…”

Section: Introductionmentioning

confidence: 99%

“…The other states |00 , |01 , and |10 keep invariant because the RRI is inexistent during the three steps. The second type is to use the bluedetuned laser to compensate the RRI with the condition [13][14][15][16][17][18][19][20][21][22], where ∆ i denotes the detuning for the i -th atom and V j denotes the RRI strength for the j -th pair of Rydberg atoms. After the pioneering works in Refs.…”

Section: Introductionmentioning

confidence: 99%

Resonant-interaction-induced Rydberg antiblockade and its applications

Song

2020

Physics Letters A

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Different from the conventional Rydberg antiblockade (RAB) regime that either requires weak Rydberg-Rydberg interaction (RRI), or compensates Rydberg-Rydberg interaction (RRI)-induced energy shift by introducing dispersive interactions, we show that RAB regime can be achieved by resonantly driving the transitions between ground state and Rydberg state under strong RRI. The Rabi frequencies are of small amplitude and time-dependent harmonic oscillation, which plays a critical role for the presented RAB. The proposed unconventional RAB regime is used to construct high-fidelity controlled-Z (CZ) gate and controlled-not (CNOT) gate in one step. Each atom requires single external driving. And the atomic addressability is not required for the presented unconventional RAB, which would simplify experimental complexity and reduce resource consumption.

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“…Unfortunately, a fundamental limitation for such blockaded gate arises from an intrinsic blockade error coming from a Rydberg level shift V , which is proportional to (Ω/V ) 2 [23] (Ω is the effective Rabi frequency) accom- * jqian1982@gmail.com panied by a blockade error around 10 −3 [24], preventing from its extensive use. In the recent years, in order to suppress this blockade error, a rich variety of alternative proposals, such as construction of a novel generalized Rabi frequency by the Rydberg energy shift [25], using technique of the electromagnetically induced transparency [26], or replacing with a long-lifed circular Rydberg state [27] and a specifically-shaped laser [28][29][30], have been extensively demonstrated, proving the reduction of gate error beyond the level of 10 −4 . Especially, a recent exotic proposal describes an accurate quantum gate by spin echo to suppress the blockade error to the order of (10 −3 ) 2 by adding two anticlockwise rotations, leading to the intrinsic error of gate beyond the level of 10 −5 which is only limited by the Rydberg state decay [31].…”

Section: Introductionmentioning

confidence: 99%

Adiabatic and high-fidelity quantum gates with hybrid Rydberg-Rydberg interactions

Yu¹,

Wang²,

Ma³

et al. 2019

Opt. Express

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Rydberg blockaded gate is a fundamental ingredient for scalable quantum computation with neutral Rydberg atoms. However the fidelity of such a gate is intrinsically limited by a blockade error coming from a Rydberg level shift that forbids its extensive use. Based on a dark-state adiabatic passage, we develop a novel protocol for realizing a two-atom blockade-error-free quantum gate in a hybrid system with simultaneous van der Waals (vdWsI) and resonant dipole-dipole interactions (DDI). The basic idea relies on converting the roles of two interactions, which is, the DDI serves as one time-dependent tunable pulse and the vdWsI acts as a negligible middle level shift as long as the adiabatic condition is preserved. We adopt an optimized super-Gaussian optical pulse with kπ (k ≫ 1) area accompanied by a smooth tuning for the DDI, composing a circular stimulated Raman adiabatic passage, which can robustly ensure a faster operation time ∼ 80ns as well as a highly-efficient gate fidelity ∼ 0.9996. This theoretical protocol offers a flexible treatment for hybrid interactions in complex Rydberg systems, enabling on-demand design of new types of effective Rydberg quantum gate devices.

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One-step implementation of the Rydberg-Rydberg-interaction gate

Cited by 107 publications

References 24 publications

Effective Rabi dynamics of Rydberg atoms and robust high-fidelity quantum gates with a resonant amplitude-modulation field

Effective Rabi dynamics of Rydberg atoms and robust high-fidelity quantum gates with a resonant amplitude-modulation field

Resonant-interaction-induced Rydberg antiblockade and its applications

Adiabatic and high-fidelity quantum gates with hybrid Rydberg-Rydberg interactions

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