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20 papers · 2 filters
Quantum-enhanced measurements: beating the standard quantum limit
Vittorio Giovannetti, Seth Lloyd, Lorenzo Maccone
Quantum mechanics, through the Heisenberg uncertainty principle, imposes limits to the precision of measurement. Conventional measurement techniques typically fail to reach these l…
Optimal phase estimation for qubit mixed states
Giacomo Mauro D'Ariano, Chiara Macchiavello, Paolo Perinotti
We address the problem of optimal estimation of the relative phase for two-dimensional quantum systems in mixed states. In particular, we derive the optimal measurement procedures…
Multipartite entanglement in quantum spin chains
D. Bruss, N. Datta, A. Ekert +2
We study the occurrence of multipartite entanglement in spin chains. We show that certain genuine multipartite entangled states, namely W states, can be obtained as ground states o…
Efficient universal programmable quantum measurements
Giacomo Mauro D'Ariano, Paolo Perinotti
A universal programmable detector is a device that can be tuned to perform any desired measurement on a given quantum system, by changing the state of an ancilla. With a finite dim…
Computing Spin Networks
Annalisa Marzuoli, Mario Rasetti
We expand a set of notions recently introduced providing the general setting for a universal representation of the quantum structure on which quantum information stands. The dynami…
Operational distance and fidelity for quantum channels
Viacheslav P. Belavkin, Giacomo Mauro D'Ariano, Maxim Raginsky
We define and study a fidelity criterion for quantum channels, which we term the minimax fidelity, through a noncommutative generalization of maximal Hellinger distance between two…