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- Ørsted (Denmark)DK26 papers
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6 papers · 2 filters
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…
Quantitative analysis of quantum dot dynamics and emission spectra in cavity quantum electrodynamics
K. H. Madsen, P. Lodahl
We present detuning-dependent spectral and decay-rate measurements to study the difference between spectral and dynamical properties of single quantum dots embedded in micropillar…
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…
Permutationally invariant state reconstruction
Tobias Moroder, Philipp Hyllus, Geza Toth +5
Feasible tomography schemes for large particle numbers must possess, besides an appropriate data acquisition protocol, also an efficient way to reconstruct the density operator fro…
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…