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Gaussian quantum information
This review focuses on continuous-variable quantum information processes that rely on any combination of Gaussian states, Gaussian operations, and Gaussian measurements, including quantum communication, quantum cryptography, quantum computation, quantum teleportation, and quantum state and channel discrimination.
Quantum illumination with Gaussian states.
By making the optimum joint measurement on the light received from the target region together with the retained spontaneous parametric down-conversion idler beam, the quantum-illumination system realizes a 6 dB advantage in the error-probability exponent over the optimum reception coherent-state system.
Fundamental limits of repeaterless quantum communications
- S. Pirandola, Riccardo Laurenza, C. Ottaviani, L. Banchi
- Computer ScienceNature communications
- 29 October 2015
The fundamental rate-loss tradeoff affecting any protocol of quantum key distribution is determined, which sets the limits of point-to-point quantum communications and provides precise and general benchmarks for quantum repeaters.
Microwave quantum illumination using a digital receiver
This work generates entangled fields to illuminate a room-temperature object at a distance of 1 m in a free-space detection setup and implements a digital phase-conjugate receiver based on linear quadrature measurements that outperforms a symmetric classical noise radar in the same conditions, despite the entanglement-breaking signal path.
Advances in Quantum Cryptography
This review begins by reviewing protocols of quantum key distribution based on discrete variable systems, and considers aspects of device independence, satellite challenges, and high rate protocols based on continuous variable systems.
Microwave quantum illumination.
- S. Barzanjeh, S. Guha, C. Weedbrook, D. Vitali, J. Shapiro, S. Pirandola
- PhysicsPhysical review letters
- 27 February 2015
The error probability of this microwave quantum-illumination system, or quantum radar, is shown to be superior to that of any classical microwave radar of equal transmitted energy.
General Benchmarks for Quantum Repeaters
Using a technique based on quantum teleportation, we simplify the most general adaptive protocols for key distribution, entanglement distillation and quantum communication over a wide class of…
Side-channel-free quantum key distribution.
All real channels are replaced with virtual channels in a QKD protocol, making the relevant detectors and settings inside private spaces inaccessible while simultaneously acting as a Hilbert space filter to eliminate side-channel attacks.
Advances in quantum teleportation
This review covers state-of-the-art quantum teleportation technologies, from photonic qubits and optical modes to atomic ensembles, trapped atoms and solid-state systems. Open issues and potential…
End-to-end capacities of a quantum communication network
- S. Pirandola
- PhysicsCommunications Physics
- 17 May 2019
This work derives single-letter upper bounds for the end-to-end capacities achievable by the most general (adaptive) protocols of quantum and private communication, from a single repeater chain to an arbitrarily complex quantum network, where systems may be routed through single or multiple paths.