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Quantum digital metrology

Venerdý 23 febbraio 2018, ore 11:00, aula L1.7, edificio Fisica, I piano, Dipartimento FIM, Modena

Relatore: Prof. Lorenzo Maccone (University of Pavia, Physics Department)

Abstract: Quantum Metrology calculates the ultimate precision of all estimation strategies, measuring what is their root mean-square error (RMSE). After a brief review on the conventional theory of quantum metrology, we introduce an extension to the digital regime, asking how many bits of the parameter we can recover, namely we derive an information-theoretic quantum metrology. In this setting we redefine "Heisenberg bound" and "standard quantum limit" (the usual benchmarks in quantum estimation theory), and show that the former can be attained only by sequential strategies or parallel strategies that employ entanglement among probes, whereas parallel-separable strategies are limited by the latter. We highlight the differences between this setting and the RMSE-based one.

Ospiti: Guido Goldoni.

[Ultimo aggiornamento: 05/02/2018 14:51:25]