11 papers
Rate limits in quantum networks with lossy repeaters
Riccardo Laurenza, Nathan Walk, Jens Eisert +1
The derivation of ultimate limits to communication over certain quantum repeater networks have provided extremely valuable benchmarks for assessing near-term quantum communication…
Dense coding capacity of a quantum channel
Riccardo Laurenza, Cosmo Lupo, Seth Lloyd +1
We consider the fundamental protocol of dense coding of classical information assuming that noise affects both the forward and backward communication lines between Alice and Bob. A…
Tight bounds for private communication over bosonic Gaussian channels based on teleportation simulation with optimal finite resources
Riccardo Laurenza, Spyros Tserkis, Leonardo Banchi +3
Upper bounds for private communication over quantum channels can be derived by adopting channel simulation, protocol stretching, and relative entropy of entanglement. All these ing…
Conditional channel simulation
Stefano Pirandola, Riccardo Laurenza, Leonardo Banchi
In this work we design a specific simulation tool for quantum channels which is based on the use of a control system. This allows us to simulate an average quantum channel which is…
Fundamental limits to quantum channel discrimination
Stefano Pirandola, Riccardo Laurenza, Cosmo Lupo +1
What is the ultimate performance for discriminating two arbitrary quantum channels acting on a finite-dimensional Hilbert space? Here we address this basic question by deriving a g…
Channel Simulation in Quantum Metrology
Riccardo Laurenza, Cosmo Lupo, Gaetana Spedalieri +2
In this review we discuss how channel simulation can be used to simplify the most general protocols of quantum parameter estimation, where unlimited entanglement and adaptive joint…