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Displacement-enhanced entanglement distillation of single-mode-squeezed entangled states
Anders Tipsmark, Jonas S. Neergaard-Nielsen, Ulrik L. Andersen
It has been shown that entanglement distillation of Gaussian entangled states by means of local photon subtraction can be improved by local Gaussian transformations. Here we show t…
Deterministic Super Resolution with Coherent States at the Shot Noise Limit
Emanuele Distante, Miroslav Jezek, Ulrik L. Andersen
Interference of light fields plays an important role in various high-precision measurement schemes. It has been shown that super resolving phase measurements beyond the standard co…
Generation of continuous-variable cluster states of cylindrically polarized modes
I. Rigas, C. Gabriel, S. Berg-Johansen +5
Cluster states are an essential component in one-way quantum computation protocols. We present two schemes to generate addressable continuous-variable cluster states from quadratur…
Heralded generation of a micro-macro entangled state
Ulrik L. Andersen, Jonas S. Neergaard-Nielsen
Using different optical setups based on squeezed state and photon subtraction we show how optical entanglement between a macroscopic and a microscopic state - the so-called Schrodi…
Experimental determination of the degree of quantum polarisation of continuous variable states
Christian Kothe, Lars Skovgaard Madsen, Ulrik Lund Andersen +1
We demonstrate excitation-manifold resolved polarisation characterisation of continuous-variable (CV) quantum states. In contrast to traditional characterisation of polarisation th…
Experimental test of strongly non-classical character of a noisy squeezed single-photon state
M. Jezek, A. Tipsmark, R. Dong +4
We experimentally verify the quantum non-Gaussian character of a conditionally generated noisy squeezed single-photon state with positive Wigner function. Employing an optimized wi…
Experimental Investigation of the Evolution of Gaussian Quantum Discord in an Open System
Lars S. Madsen, Adriano Berni, Mikael Lassen +1
Gaussian quantum discord is a measure of quantum correlations in Gaussian systems. Using Gaussian discord we quantify the quantum correlations of a bipartite entangled state and a…
QPSK coherent state discrimination via a hybrid receiver
Christian R. Müller, Mario A. Usuga, Christoffer Wittmann +4
We propose and experimentally demonstrate a near-optimal discrimination scheme for the quadrature phase shift keying protocol (QPSK). We show in theory that the performance of our…