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The work addresses a practical verification problem: estimating how similar two distant continuous-variable quantum states are, using only local operations and classical messaging, with explicit error bounds and resource costs. The protocols are theoretically grounded, but the optimal coordinated Haar measurements are hard to realise experimentally, and the article leaves open which protocol best balances accuracy against feasibility. Readers should treat this as a step toward networked benchmarking, not a deployed tool.
Quantum System Comparison Achieves Certified Estimates with Defined Error Bounds
Previously lacking rigorous mathematical foundations, quantifying similarity between distant quantum states now comes with guaranteed error margins and resource needs. These new protocols, using techniques like coordinated displacement and Haar measurements, certify estimations of inner products between unknown bosonic states through only local operations and classical communication. While theoretically optimal coordinated Haar measurements pose experimental hurdles, this work establishes a path toward dependable benchmarking in complex quantum networks.
Distant quantum computers can now reliably compare their progress without sharing hardware or revealing sensitive state information. Three new protocols estimate the ‘inner product’ between unknown continuous-variable quantum states held in separate locations, relying only on local operations and classical communication at National University of Defence Technology. This enables benchmarking and verification across different platforms when directly comparing states is impractical, supporting quantification of similarities even with limited classical predictions. Protocols rigorously compare unknown quantum…
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