Universal device for two-qubit entangled measurements via photonic quantum walks - Archive ouverte HAL
Article Dans Une Revue Physical Review Applied Année : 2023

Universal device for two-qubit entangled measurements via photonic quantum walks

Wen-Zhe Yan
  • Fonction : Auteur
Zhibo Hou
  • Fonction : Auteur
Jun-Feng Tang
  • Fonction : Auteur
Guo-Yong Xiang
  • Fonction : Auteur
Chuan-Feng Li
  • Fonction : Auteur
Guang-Can Guo
  • Fonction : Auteur

Résumé

Sophisticated positive-operator-valued measures (POVMs) are fundamental to obtain a quantum advantage in many informational problems but are difficult to implement. We design a universal measurement device composed of cascaded quantum-walk modules able to realize arbitrary entangled POVMs on two qubits. Only parameters in the modules need reprogramming for different POVMs. We apply our device to the task of direction guessing, realizing nine different five-outcome entangled measurements (fidelities above 0.9850) via nine-step photonic quantum walks, recovering optimal direction guessing from nonideal input states. Our work marks an important step toward building a universal versatile quantum measurement device able to implement optimal measurements for various quantum information tasks.

Dates et versions

hal-04243718 , version 1 (16-10-2023)

Identifiants

Citer

Wen-Zhe Yan, Zhibo Hou, Jun-Feng Tang, Guo-Yong Xiang, Chuan-Feng Li, et al.. Universal device for two-qubit entangled measurements via photonic quantum walks. Physical Review Applied, 2023, 20 (4), pp.044032. ⟨10.1103/PhysRevApplied.20.044032⟩. ⟨hal-04243718⟩
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