Generation of hyperentangled state encoded in three degrees of freedom

Zhao, Peng; Yang, Meng-Ying; Zhu, Sha; Zhou, Lan; Zhong, Wei; Du, Ming-Ming; Sheng, Yu-Bo

doi:10.1007/s11433-023-2164-7

Cited by 12 publications

(1 citation statement)

References 99 publications

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“…[60,61] The generation of various hyperentanglement has been widely researched. [62][63][64] As shown in Fig. 1, the one-step QD protocol can be described as follows.…”

Section: One-step Qd Protocolmentioning

confidence: 99%

One-step quantum dialogue

Zhu 朱,

Zhong 钟,

Du 杜

et al. 2024

Chinese Phys. B

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Quantum dialogue (QD) enables two communication parties to directly exchange secret messages simultaneously. In conventional QD protocols, photons need to transmit in the quantum channel for two rounds. In this paper, we propose a one-step QD protocol based on the hyperentanglement. With the help of the non-local hyperentanglement-assisted Bell state measurement (BSM), the photons only need to transmit in the quantum channel once. We prove that our one-step QD protocol is secure in theory and numerically simulate its secret message capacity under practical experimental condition. Comparing with previous QD protocols, the one-step QD protocol can effectively simplify the experiment operations and reduce the message loss caused by the photon transmission loss. Meanwhile, the non-local hyperentanglement-assisted BSM has a success probability of 100% and is feasible with linear optical elements. Moreover, combing with the hyperentanglement heralded amplification and purification, our protocol is possible to realize long-distance one-step QD.

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“…[60,61] The generation of various hyperentanglement has been widely researched. [62][63][64] As shown in Fig. 1, the one-step QD protocol can be described as follows.…”

Section: One-step Qd Protocolmentioning

confidence: 99%

One-step quantum dialogue

Zhu 朱,

Zhong 钟,

Du 杜

et al. 2024

Chinese Phys. B

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Universal Highly Effective Entanglement Purification with Single‐Copy Hyperentangled State

Zhang,

Qi,

Yang

et al. 2023

Annalen der Physik

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Entanglement purification is a powerful way to protect the quality of entangled system from channel noise and environment noise. A universal highly effective entanglement purification protocol with single‐copy hyperentangled state (H‐UHEPP) is proposed for distillable mixed entangled states with bilateral controlled‐not gate operations, bilateral asymmetrical rotation operations and single photon Bell‐state measurements, where all of these operations and measurements are easy to implement in polarization, spatial and time‐bin degrees of freedom (DOFs) of photon system. This H‐UHEPP, which requires only one pair of hyperentangled photons and simple unitary operations on three DOFs of a photon, can significantly enhance the fidelity of the purified state compared with the previous works. As a consequence, H‐UHEPP can speed up the entanglement purification process and reduce the resource consumption, which makes it useful in future quantum information processing.

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Improved Entanglement‐Based High‐Dimensional Optical Quantum Computation with Linear Optics

Gao,

Song,

Wei

2024

Annalen der Physik

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Quantum gates are the essential block for quantum computers. High‐dimensional quantum gates exhibit remarkable advantages over their 2D counterparts for some quantum information processing tasks. Here, a family of entanglement‐based optical controlled‐SWAP gates on is presented. With the hybrid encoding, the control qubits and target qudits are encoded in photonic polarization and spatial degrees of freedom, respectively. The circuit is constructed using only () linear optics, beating an earlier result of 14 linear optics with . The circuit depth five is much lower than an earlier result of 11 with . Besides, the fidelity of the presented circuit can reach 99.4%, and it is higher than the previous counterpart with . The scheme is constructed in a deterministic way without any borrowed ancillary photons or measurement‐induced nonlinearities. Moreover, the approach allows .

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Generation of hyperentangled state encoded in three degrees of freedom

Cited by 12 publications

References 99 publications

One-step quantum dialogue

One-step quantum dialogue

Universal Highly Effective Entanglement Purification with Single‐Copy Hyperentangled State

Improved Entanglement‐Based High‐Dimensional Optical Quantum Computation with Linear Optics

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