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12 papers · 2 filters
Parsing Squeezed Light into Polarization Manifolds
C. R. Müller, L. S. Madsen, A. Klimov +4
We investigate polarization squeezing in squeezed coherent states with varying coherent amplitudes. In contrast to the traditional characterization based on the full Stokes paramet…
Heralded Source of Bright Multi-mode Mesoscopic Sub-Poissonian Light
Timur Sh. Iskhakov, Vladyslav C. Usenko, Ulrik L. Andersen +3
In a direct detection scheme we observed 7.8 dB of twin-beam squeezing for multi-mode two-color squeezed vacuum generated via parametric down conversion. Applying post-selection, w…
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…
Enhanced DC-Field Metrology Using Nitrogen Vacancy Spins via Strong Collective Coupling and Fano-Scattering
Haitham A. R. El-Ella, Ulrik Lund Andersen, Alexander Huck
Nitrogen-vacancy ensembles promise an unprecedented combination of sensitivity and resolution for magnetic field sensing under ambient conditions. However, their full sensing poten…
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-…
Algebraic and algorithmic frameworks for optimized quantum measurements
Amine Laghaout, Ulrik L. Andersen
Von Neumann projections are the main operations by which information can be extracted from the quantum to the classical realm. They are however static processes that do not adapt t…
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…
An integrated source of broadband quadrature squeezed light
Ulrich B. Hoff, Bo M. Nielsen, Ulrik L. Andersen
An integrated silicon nitride resonator is proposed as an ultra-compact source of bright single-mode quadrature squeezed light at 850 nm. Optical properties of the device are inves…
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…