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

Yu, Dongmin; Wang, Han; Ma, Danan; Zhao, Xing-Dong; Qian, Jing

doi:10.1364/oe.27.023080

Cited by 19 publications

(18 citation statements)

References 59 publications

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“…Finally, during the gate operation, the population of Rydberg states may lead to decoherence [18]. Especially for the case where the Rydberg states are shelved for a while [1,15,[19][20][21][22][23], the decoherence effect is significant. * jsong@hit.edu.cn…”

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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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: 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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“…Third, there are several Rydberg gate protocols based on pulse shaping or stimulated Raman adiabatic passage [48][49][50][51][52][53]. The reason for these gates to have high fidelity is that the time-dependent Rabi frequency can suppress the blockade error, but the motional dephasing is still there.…”

Section: Discussion a Application In Gate Protocols With High Intrins...mentioning

confidence: 99%

“…The reason for these gates to have high fidelity is that the time-dependent Rabi frequency can suppress the blockade error, but the motional dephasing is still there. Thus, it is possible to use the theory in this work to recover the high intrinsic fidelity for the gate protocols in [48][49][50][51][52][53].…”

Section: Discussion a Application In Gate Protocols With High Intrins...mentioning

confidence: 99%

Doppler-resilient ground-Rydberg transition and its application in high-fidelity entangling gates with neutral atoms

Shi

2019

Preprint

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The motion-induced dephasing is a severe problem that limits the accuracy of a quantum control process by using external laser fields in neutral Rydberg atoms. This dephasing is a major issue that limits the realizable fidelity of a quantum entangling gate with neutral atoms when there is a gap time for the Rydberg atom to drift freely. We find that such a dephasing can be largely suppressed by using a transition in a 'V'-type dual-rail configuration. The left (right) arm of this 'V' represents a transition to a Rydberg state |r 1(2) with a Rabi frequency Ωe ikz (Ωe −ikz ), where z is frozen without atomic drift, but changes linearly in each experimental cycle. Such a configuration is equivalent to a transition between the ground state and a hybrid and time-dependent Rydberg state with a Rabi frequency √ 2Ω, such that there is no phase error whenever the state returns to the ground state. We study two applications of this method. First, it is possible to faithfully transfer the atomic state between a hyperfine ground state |1 and Rydberg states |r 1(2) with no gap time between the excitation and deexcitation. Second, by adding infrared laser fields to induce transition between |r 1(2) and a nearby Rydberg state |r3 via a largely detuned low-lying intermediate state in the gap time, the atom can keep its internal state in the Rydberg level as well as adjust the population branching in |r 1(2) during the gap time. This allows an almost perfect Rydberg deexcitation after the gap time, making it possible to recover a high fidelity in the Rydberg blockade gate. The theory paves the way for high-fidelity quantum control over neutral Rydberg atoms without cooling qubits to the motional ground states in optical traps.

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“…The single-qubit unitary operations are performed locally through external control fields and have been im- plemented with very high fidelity in various physical setups. The two-qubit entangling gate, however, can only be realized through interaction between the two qubits [17] and have been realized in quantum dots [56,60], dopant-based systems [38], optical lattices [14,46], ion traps [4,5,32,37,55], super conducting devices [8,30], Rydberg atoms [68] and diamond nitrogen-vacancy centers [39]. The demand for direct interaction makes the realization of twoqubit gates very challenging for distant qubits.…”

Section: Introductionmentioning

confidence: 99%

Parallel entangling gate operations and two-way quantum communication in spin chains

Yousefjani

Bayat

2021

Quantum

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The power of a quantum circuit is determined through the number of two-qubit entangling gates that can be performed within the coherence time of the system. In the absence of parallel quantum gate operations, this would make the quantum simulators limited to shallow circuits. Here, we propose a protocol to parallelize the implementation of two-qubit entangling gates between multiple users which are spatially separated, and use a commonly shared spin chain data-bus. Our protocol works through inducing effective interaction between each pair of qubits without disturbing the others, therefore, it increases the rate of gate operations without creating crosstalk. This is achieved by tuning the Hamiltonian parameters appropriately, described in the form of two different strategies. The tuning of the parameters makes different bilocalized eigenstates responsible for the realization of the entangling gates between different pairs of distant qubits. Remarkably, the performance of our protocol is robust against increasing the length of the data-bus and the number of users. Moreover, we show that this protocol can tolerate various types of disorders and is applicable in the context of superconductor-based systems. The proposed protocol can serve for realizing two-way quantum communication.

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

Cited by 19 publications

References 59 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

Doppler-resilient ground-Rydberg transition and its application in high-fidelity entangling gates with neutral atoms

Parallel entangling gate operations and two-way quantum communication in spin chains

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