Directional quantum state transfer in a dissipative Rydberg-atom-cavity system

Li, D. X.; Shao, Xiao‐Qiang

doi:10.1103/physreva.99.032348

Cited by 28 publications

(18 citation statements)

References 69 publications

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“…Traditionally, it has been considered only having detrimental effects on quantum information processing. Nevertheless, recent studies show that the environment can be used as a resource for quantum computation and entanglement generation [14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29]. In particular, Kastoryano et.al [17] discussed the possibility of preparing highly entangled states via the loss of photon from an optical cavity.…”

Section: Introductionmentioning

confidence: 99%

Deterministic generation of maximally discordant mixed states by dissipation

Yin

et al. 2020

Phys. Rev. A

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Entanglement can be considered as a special quantum correlation, but not the only kind. It is allowed to exist non-classical correlations even for a separable quantum system. Here we propose two dissipative schemes for generating a maximally correlated state of two qubits in the absence of quantum entanglement, which was raised by [F. Galve, G. L. Giorgi, and R. Zambrini, Phys. Rev. A 83, 012102 (2011)]. These protocols take full advantages of the interaction between four-level atoms and strongly lossy optical cavities. In the first scenario, we alternatively change the phases of Rabi frequencies of two classical driving fields, while the second proposal introduces a strongly lossy coupled-cavity system. Both schemes can realize all Lindblad terms required by the dissipative dynamics, guaranteeing the maximally quantum dissonant state to be the unique steady state for a certain subspace of system. Moreover, since the target state is a mixed state, the performance of our method is evaluated by the definition of super-fidelity G(ρ1, ρ2), and the strictly numerical simulations indicate that fidelity outstripping 99% of the quantum dissonant state is achievable with the current cavity quantum electrodynamics parameters.

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Section: Introductionmentioning

confidence: 99%

Deterministic generation of maximally discordant mixed states by dissipation

Yin

et al. 2020

Phys. Rev. A

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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%

“…Also, the dynamics of the direct laser excitation of a pair of Rydberg atoms was also studied based on this type of RAB [16]. Then this type of RAB was generalized to multiple-qubit case under asymmetry RRI [18] and used to construct quantum logic gate [17,18] and prepare quantum entangled state [19,22]. Different from the conventional RAB regimes mentioned above, in this letter we show that, through modulating the Rabi frequency, a frequency-matched resonant classical laser can excite more than one Rydberg atoms under strong RRI in one step.…”

Section: Introductionmentioning

confidence: 99%

“…(2) is equivalent to that driven dispersively by two classical fields with the same Rabi frequency Ω m /2 but with opposite detuning. Besides, the blue-detuned dispersive interaction can be used to compensate RRI-(with positive value)-induced energy shift [9][10][11][12][13][14][15][16][17][18][19][20]22] and further realize the RAB. For convenience, we investigate the dynamics of the two-atom system in the rotation frame with respect tô H rr under the two-atom basis |mn (m, n = 0, 1, r).…”

Section: Introductionmentioning

confidence: 99%

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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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Dissipative engineering of a tripartite Greenberger–Horne–Zeilinger state for neutral atoms

Chong

Shao

2021

Quantum Engineering

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The multipartite Greenberger–Horne–Zeilinger (GHZ) states are indispensable elements for various quantum information processing tasks. Here we put forward two deterministic proposals to dissipatively prepare tripartite GHZ states in a neutral atom system. The first scheme utilizes the polychromatic driving fields and the engineered spontaneous emission of Rydberg states to generate a tripartite GHZ state with a high efficiency, which is then optimized by introducing the Gaussian soft control pulse. In the second scenario, we exploit the natural spontaneous emission of the Rydberg states as a resource, thence a steady tripartite GHZ state with fidelity around 98% can be obtained by simultaneously integrating the switching driving of unconventional Rydberg pumping and the Rydberg antiblockade effect.

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Directional quantum state transfer in a dissipative Rydberg-atom-cavity system

Cited by 28 publications

References 69 publications

Deterministic generation of maximally discordant mixed states by dissipation

Deterministic generation of maximally discordant mixed states by dissipation

Resonant-interaction-induced Rydberg antiblockade and its applications

Dissipative engineering of a tripartite Greenberger–Horne–Zeilinger state for neutral atoms

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