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30 years of squeezed light generation
Ulrik L. Andersen, Tobias Gehring, Christoph Marquardt +1
Squeezed light generation has come of age. Significant advances on squeezed light generation has been made over the last 30 years - from the initial, conceptual experiment in 1985…
Quantum cryptography with an ideal local relay
Gaetana Spedalieri, Carlo Ottaviani, Samuel L. Braunstein +4
We consider two remote parties connected to a relay by two quantum channels. To generate a secret key, they transmit coherent states to the relay, where the states are subject to a…
MDI-QKD: Continuous- versus discrete-variables at metropolitan distances
Stefano Pirandola, Carlo Ottaviani, Gaetana Spedalieri +6
In a comment, Xu, Curty, Qi, Qian, and Lo claimed that discrete-variable (DV) measurement device independent (MDI) quantum key distribution (QKD) would compete with its continuous-…
Continuous Variable Quantum Key Distribution with a Noisy Laser
Christian S. Jacobsen, Tobias Gehring, Ulrik L. Andersen
Existing experimental implementations of continuous-variable quantum key distribution require shot-noise limited operation, achieved with shot-noise limited lasers. However, loosen…
Single-Quadrature Continuous-Variable Quantum Key Distribution
Tobias Gehring, Christian S. Jacobsen, Ulrik L. Andersen
Most continuous-variable quantum key distribution schemes are based on the Gaussian modulation of coherent states followed by continuous quadrature detection using homodyne detecto…
Non-Markovian Reactivation of Quantum Relays
Stefano Pirandola, Carlo Ottaviani, Christian S. Jacobsen +4
We consider a quantum relay which is used by two parties to perform several continuous-variable protocols: Entanglement swapping, distillation, quantum teleportation, and quantum k…
Ab-initio Quantum Enhanced Optical Phase Estimation Using Real-time Feedback Control
Adriano A. Berni, Tobias Gehring, Bo M. Nielsen +3
Optical phase estimation is a vital measurement primitive that is used to perform accurate measurements of various physical quantities like length, velocity and displacements. The…