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Ultimate Precision of Adaptive Noise Estimation
Stefano Pirandola, Cosmo Lupo
We consider the estimation of noise parameters in a quantum channel, assuming the most general strategy allowed by quantum mechanics. This is based on the exploitation of unlimited…
A Quantum Enigma Machine: Experimentally Demonstrating Quantum Data Locking
Daniel J. Lum, M. S. Allman, Thomas Gerrits +5
Claude Shannon proved in 1949 that information-theoretic-secure encryption is possible if the encryption key is used only once, is random, and is at least as long as the message it…
Ultimate precision bound of quantum and sub-wavelength imaging
Cosmo Lupo, Stefano Pirandola
We determine the ultimate potential of quantum imaging for boosting the resolution of a far-field, diffraction-limited, linear imaging device within the paraxial approximation. Fir…
Super-Additivity and Entanglement Assistance in Quantum Reading
Cosmo Lupo, Stefano Pirandola
Quantum information theory determines the maximum rates at which information can be transmitted through physical systems described by quantum mechanics. Here we consider the commun…
Thermal quantum metrology in memoryless and correlated environments
Gaetana Spedalieri, Cosmo Lupo, Samuel L. Braunstein +1
In bosonic quantum metrology, the estimate of a loss parameter is typically performed by means of pure states, such as coherent, squeezed or entangled states, while mixed thermal p…