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QI: Fachverband Quanteninformation

QI 9: Quantum Entanglement II

QI 9.6: Vortrag

Dienstag, 11. März 2025, 12:15–12:30, HS IX

Beating the Optimal Verification of Entangled States via Collective Strategies — •Ye-chao Liu¹ and Jiangwei Shang² — ¹Zuse-Institut Berlin, Takustraße 7, 14195 Berlin, Germany — ²Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement (MOE), School of Physics, Beijing Institute of Technology, Beijing 100081, China

In the realm of quantum information processing, the efficient characterization of entangled states poses an overwhelming challenge, rendering the traditional methods including quantum tomography unfeasible and impractical. To tackle this problem, we propose a new verification scheme using collective strategies, showcasing arbitrarily high efficiency that beats the optimal verification with global measurements. Our collective scheme can be implemented in various experimental platforms and scalable for large systems with a linear scaling on hardware requirement, and distributed operations are allowed. More importantly, the approach consumes only a few copies of the entangled states, while ensuring the preservation of unmeasured ones, and even boosting their fidelity for any subsequent tasks. Furthermore, our protocol provides additional insight into the specific types of noise affecting the system, thereby facilitating potential targeted improvements. These advancements hold promise for a wide range of applications, offering a pathway towards more robust and efficient quantum information processing.

Keywords: quantum verification; quantum benchmarking; quantum entanglement; quantum measurements; quantum tomography