Transmission and transformation of entangled states with high fidelity in a non-Hermitian system

Tang, Zan; Wang, Bo; Chen, Tian; Zhang, Xiangdong

doi:10.1103/physrevresearch.4.043144

Cited by 2 publications

(3 citation statements)

References 74 publications

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“…In fact, the other physical systems also can implement the non-unitary DTQW model, for example, the topolectrical circuits [15,16] and the optic system. [14,18,59,60] Our work also inspires the implementation of the non-Hermitian dynamical phenomenon in the other experiment platform. Besides, we also provide the remaining probability of states on all our designs for experimenters in supplemental material VI.…”

Section: Discussionmentioning

confidence: 83%

“…In other experiment platforms, the non-unitary DTQW system also serves as the non-Hermitian simulation. [14][15][16]18,59,60] The standard DTQW [54,61] describes the quantummechanical discrete-time evolution of particles (called "quantum walkers"). It is defined on the Hibert space spanned by the coin space {|↑⟩, |↓⟩} and the position space {|x⟩}.…”

Section: Standard Dtqw and Non-unitary Dtqwmentioning

confidence: 99%

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Anomalous non-Hermitian dynamical phenomenon on the quantum circuit

et al. 2023

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The anomalous non-Hermitian dynamical phenomenon with the non-Hermitian skin effect (NHSE) attracts wide attention due to its novel physics and promising applications. Here, we propose a new type of non-unitary discrete-time quantum walk system demonstrating the NHSE and anomalous non-Hermitian dynamical phenomena, including the dynamical chiral phenomenon, the funneling phenomenon on the domain wall, and the anomalous reflection on the phase impurity. Furthermore, we design the quantum circuit experiments of these quantum walk systems and numerically simulate them with quantum noises to verify the robustness of the non-Hermitian dynamical phenomenon on the noisy intermediate-scale quantum (NISQ) devices. Our work paves the way for implementing the non-Hermitian dynamical phenomenon on the quantum circuit.

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Section: Discussionmentioning

confidence: 83%

Section: Standard Dtqw and Non-unitary Dtqwmentioning

confidence: 99%

Anomalous non-Hermitian dynamical phenomenon on the quantum circuit

et al. 2023

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“…The problem is that the fidelities of entangled states become very low after these reported topologically protected operations. Although the transformation efficiency of entangled states can be improved by using inverse-design method 16 , 17 , various parameters need to be designed for the transformation between different entangled states. Moreover, the signal also scatters to non-topologically protected channels, resulting in significant losses in the transformation of entangled states.…”

Section: Introductionmentioning

confidence: 99%

Topologically protected entanglement switching around exceptional points

Tang,

Chen,

Tang

et al. 2024

Light Sci Appl

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The robust operation of quantum entanglement states is crucial for applications in quantum information, computing, and communications1–3. However, it has always been a great challenge to complete such a task because of decoherence and disorder. Here, we propose theoretically and demonstrate experimentally an effective scheme to realize robust operation of quantum entanglement states by designing quadruple degeneracy exceptional points. By encircling the exceptional points on two overlapping Riemann energy surfaces, we have realized a chiral switch for entangled states with high fidelity. Owing to the topological protection conferred by the Riemann surface structure, this switching of chirality exhibits strong robustness against perturbations in the encircling path. Furthermore, we have experimentally validated such a scheme on a quantum walk platform. Our work opens up a new way for the application of non-Hermitian physics in the field of quantum information.

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Transmission and transformation of entangled states with high fidelity in a non-Hermitian system

Cited by 2 publications

References 74 publications

Anomalous non-Hermitian dynamical phenomenon on the quantum circuit

Anomalous non-Hermitian dynamical phenomenon on the quantum circuit

Topologically protected entanglement switching around exceptional points

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