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Large Scale Energy Efficient Sensor Network Routing Using a Quantum Processor Unit

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Published on: September 8, 2023

Quantum-Enhanced Metrology with Network States.

Yuxiang Yang¹, Benjamin Yadin², Zhen-Peng Xu³

¹QICI Quantum Information and Computation Initiative, Department of Computer Science, The University of Hong Kong, Pokfulam Road, Hong Kong, China.

Physical Review Letters

|June 10, 2024

Summary

This summary is machine-generated.

Quantum networks offer enhanced sensing but face limitations with complex network states. Genuine multipartite entanglement is crucial for quantum advantage in parameter estimation, with a protocol achieving the Heisenberg limit.

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Area of Science:

Quantum Information Science
Quantum Metrology
Networked Quantum Systems

Background:

Quantum sensors in networks promise superior distributed sensing (e.g., clock synchronization).
Previous analyses focused on idealized networks, overlooking complexities of practical quantum network states.
Understanding performance limits in realistic quantum networks is essential.

Purpose of the Study:

To establish a general performance bound for quantum metrology using network states.
To identify the necessity of genuine multipartite entanglement for quantum advantage.
To explore protocols for achieving ultimate quantum sensing limits in networks.

Main Methods:

Derivation of a general bound on parameter estimation using quantum network states.
Analysis of entanglement requirements for quantum advantage.
Design of a probabilistic protocol for enhanced metrology.

Main Results:

A general bound limits performance with arbitrary quantum network states.
Genuine multipartite entanglement is proven necessary for quantum advantage.
The bound serves as an entanglement witness and applies to shallow-circuit states.
A probabilistic protocol achieves the Heisenberg limit while preserving privacy.

Conclusions:

Quantum metrology in networks is constrained by network state complexity.
Genuine multipartite entanglement is a key resource for quantum advantage.
A viable protocol demonstrates the possibility of reaching ultimate quantum sensing limits in networks.