Chunfang Sun

Generation of Long‐Distance Greenberger–Horne–Zeilinger States in a Driven Hybrid Quantum System

Xin Zeng, M LI, Bo Tian, Chunfang Sun et autres

ABSTRACT We propose a theoretical protocol for generating long‐distance Greenberger‐Horne‐Zeilinger states in a driven hybrid quantum system. The system consists of a central magnon coupled to multiple nitrogen–vacancy center spins positioned at a distance from the surface of the yttrium‐iron‐garnet sphere. A …

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Magnonic entanglement in a chiral cavity-magnon coupling system

Xin Zeng, Wuji Zhang, Chunfang Sun, Chunfeng Wu et autres

The generation of magnon entanglement and squeezing plays a crucial role in quantum information processing. In this study, we propose a scheme based on a chiral cavity-magnon system, which consists of a torus-shaped cavity and two yttrium iron garnet spheres. The magnon …

Protecting Quantum Gates from Arbitrary Single‐ and Two‐Qubit Errors

Gangcheng Wang, Chunfeng Wu, Chunfang Sun, Xun‐Li Feng

Abstract The protection of quantum gates from arbitrary single‐ and two‐qubit noises with properly designed dynamical decoupling (DD) pulses is explored. The proposed dynamical decoupling method is a concatenation of a sequence of pulses formed by , with another sequence constructed by …

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Decoherence-protected holonomic gates with reduced requirements for physical resources

Chunfeng Wu, Chunfang Sun, Jiangang Ma, Ding Huang et autres

We study the implementation of holonomic quantum gates preserved from arbitrary single-qubit and two-qubit decoherence or errors using a dynamical decoupling approach. To integrate the holonomic feature with the dynamical decoupling technique, we require only one auxiliary qubit for single-qubit gates and …

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Quantum Gates with Different Robust Merits

Chunfang Sun, Yimin Wang, Gangcheng Wang, Chunfeng Wu

Abstract A protocol for implementing a universal set of quantum gates, which are safeguarded from noise through geometric, dephasing‐free, and dynamical‐decoupling approaches is proposed. With properly designed Hamiltonians, the desired interactions are realized directly within the Schrödinger picture rather than relying on …

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Generation of high-fidelity Greenberger-Horne-Zeilinger states in a driven hybrid quantum system

Xin Zeng, Yuxin Kang, Chunfang Sun, Chunfeng Wu et autres

In this study, we propose a theoretical scheme for achieving long-distance Greenberger-Horne-Zeilinger states in a driven hybrid quantum system. By applying a microwave field to the YIG sphere, we utilize the Kerr effect to induce the squeezing of the magnon, thereby achieving …

Ground-state chiral excitation via periodic modulation

Shuyue Wang, Wuji Zhang, Chunfang Sun, Chunfeng Wu et autres

In this study we engineer the $z$ component of the Dzyaloshinskii-Moriya interaction mediated by photons to emulate ground-state chiral excitation based on three-level atoms driven by quantum and classical fields. We employ adiabatic elimination techniques to derive an effective Dzyaloshinskii-Moriya interaction Hamiltonian …

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Holonomic swap and controlled-swap gates of neutral atoms via selective Rydberg pumping

Chunfang Sun, X. Y. Chen, W. L. Mu, G.-C. Wang et autres

Abstract Holonomic quantum computing offers a promising paradigm for quantum computation due to its error resistance and the ability to perform universal quantum computations. Here, we propose a scheme for the rapid implementation of a holonomic swap gate in neutral atomic systems, …

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Ground-state chiral current via periodic modulation

Shuyue Wang, Wuji Zhang, Chunfang Sun, Chunfeng Wu et autres

In this study, we engineer the Dzyaloshinskii-Moriya interaction mediated by photons to emulate ground-state chiral current based on three-level atoms driven by quantum and classical fields. We employ adiabatic elimination techniques to derive an effective Dzyaloshinskii-Moriya interaction Hamiltonian of two-level systems, which …

Entangling two Dicke states in a periodic modulated quantum system

Wuji Zhang, Ruifang Wu, Chunfang Sun, Chunfeng Wu et autres

We propose a theoretical approach for entangling two Dicke states in a periodic modulated quantum system. By considering two qubit ensembles that are nonuniformly coupled to a common resonator, we can derive an effective Hamiltonian whose energy levels depend nonlinearly on the …

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Entangling two Dicke states in a periodic modulated quantum system

Wuji Zhang, Ruifang Wu, Chunfang Sun, Chunfeng Wu et autres

We propose a theoretical approach for entangling two Dicke states in a periodic modulated quantum system. By considering two qubit ensembles that are nonuniformly coupled to a common resonator, we can derive an effective Hamiltonian whose energy levels depend nonlinearly on the …

Decoherence-Protected Implementation of Quantum Gates

Chunfeng Wu, Chunfang Sun, Jing‐Ling Chen, X. X. Yi

We present a scheme to implement a universal set of quantum gates based on achievable interactions, and the gates can be protected against decoherence through a dynamical-decoupling approach without encoding. By properly designing system evolution, the desired system interactions commute with the …

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