Distinct antiblockade features of strongly interacting Rydberg atoms under a two-color weak excitation scheme

Bai, Song; Tian, Xue-Dong; Xiao, Han; Jiao, Yuechun; Wu, Jin-Hui; Zhao, Jianming; Jia, Suotang

doi:10.1088/1367-2630/ab6575

Cited by 22 publications

(17 citation statements)

References 39 publications

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“…Note that the physical regime is different from either the Rydberg blockade or antiblockade. In our protocol the first sideband of the modulation field offsets the control-target RRI, where ω = V jt is similar to the Rydberg antiblockade condition [91][92][93][94][95]. For a normal process of Rydberg antiblockade, a doubly-excited state can be achieved from |χ M 1 ⟩ to |χ M 4 ⟩, where the latter includes two Rydberg states.…”

Section: B Multiqubit Nhqc Gatesmentioning

confidence: 99%

Systematic-Error-Tolerant Multiqubit Holonomic Entangling Gates

Wang

Han

et al. 2021

Phys. Rev. Applied

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Quantum holonomic gates hold built-in resilience to local noises and provide a promising approach for implementing fault-tolerant quantum computation. We propose to realize high-fidelity holonomic (N + 1)-qubit controlled gates using Rydberg atoms confined in optical arrays or superconducting circuits. We identify the scheme, deduce the effective multi-body Hamiltonian, and determine the working condition of the multiqubit gate. Uniquely, the multiqubit gate is immune to systematic errors, i.e., laser parameter fluctuations and motional dephasing, as the N control atoms largely remain in the much stable qubit space during the operation. We show that CN -NOT gates can reach same level of fidelity at a given gate time for N ≤ 5 under a suitable choice of parameters, and the gate tolerance against errors in systematic parameters can be further enhanced through optimal pulse engineering. In case of Rydberg atoms, the proposed protocol is intrinsically different from typical schemes based on Rydberg blockade or antiblockade. Our study paves a new route to build robust multiqubit gates with Rydberg atoms trapped in optical arrays or with superconducting circuits. It contributes to current efforts in developing scalable quantum computation with trapped atoms and fabricable superconducting devices.

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Section: B Multiqubit Nhqc Gatesmentioning

confidence: 99%

Systematic-Error-Tolerant Multiqubit Holonomic Entangling Gates

Wang

Han

et al. 2021

Phys. Rev. Applied

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“…It was further extended to a mesoscopic regime of many-atom ensemble qubits 4 . Rydberg blockade and antiblockade has also been suggested as a way to generate many-particle entanglement 5 – 12 . Carr and Saffman have proposed and analysed an approach for preparation of high fidelity entanglement and anti-ferromagnetic states using Rydberg mediated interaction with dissipation for two atom singlet 13 .…”

Section: Introductionmentioning

confidence: 99%

Few generalized entropic relations related to Rydberg atoms

Kumar

Prasad

2022

Sci Rep

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We calculate the analytical and numerical values of the position space Shannon entropy, momentum space Shannon entropy, and total Shannon entropy, $$S_\rho$$ S ρ , $$S_\gamma$$ S γ , and $$S_T$$ S T , respectively, of free and trapped Rydberg hydrogen-like atoms. The influence of atomic number Z, the principal quantum number n, and energy E on the Shannon entropy of the Rydberg atoms are illustrated. The scaling properties of Shannon entropy with energy of states E and the principal quantum number n have been reported for the first time to the best of our knowledge. Our work explains how Shannon entropy indicates localization-delocalization of the wavefunction. The total Shannon entropy as a measure of the number of nodes in the trapped Rydberg atom’s wavefunction is also discussed. We show why an uncertainty relation based on Shannon entropy is superior to Heisenberg uncertainty for Rydberg atoms.

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“…RAB plays roles in the study of motional effects [22,23], dissipative dynamics [24][25][26], periodically driving [27], and quantum computation [28,29]. RAB was also studied in detection of structural phase transitions [30], Rydberg spin system [31], cold atom ensemble [32], as well as in strongly interacting Rydberg atom experiment [33].…”

Section: Introductionmentioning

confidence: 99%

Dipole-dipole-interaction–driven antiblockade of two Rydberg atoms

2021

Phys. Rev. A

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Resonant laser excitation of multiple Rydberg atoms are prohibited, leading to Rydberg blockade, when the long-range van der Waals interactions are stronger than the laser-atom coupling. Rydberg blockade can be violated, i.e. simultaneous excitation of more than one Rydberg atoms, by off-resonant laser excitation, causing an excitation antiblockade. Rydberg antiblockade gives rise to strongly correlated many-body dynamics and spin-orbit coupling, and also finds quantum computation applications. Instead of commonly used van der Waals interactions, we investigate antiblockade dynamics of two Rydberg atoms interacting via dipole-dipole exchange interactions. We study typical situations in current Rydberg atoms experiments, where different types of dipole-dipole interactions can be achieved by varying Rydberg state couplings. Effective Hamiltonian governing underlying antiblockade dynamics is derived. We illustrate that geometric gates can be realized with the Rydberg antiblockade which is robust against decay of Rydberg states. Our study may stimulate new experimental and theoretical exploration of quantum optics and strongly interacting many-body dynamics with Rydberg antiblockade driven by dipole-dipole interactions.

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Distinct antiblockade features of strongly interacting Rydberg atoms under a two-color weak excitation scheme

Cited by 22 publications

References 39 publications

Systematic-Error-Tolerant Multiqubit Holonomic Entangling Gates

Systematic-Error-Tolerant Multiqubit Holonomic Entangling Gates

Few generalized entropic relations related to Rydberg atoms

Dipole-dipole-interaction–driven antiblockade of two Rydberg atoms

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