536 citations · 1.1k across the 13 of their papers we have counts for
13 papers
Fading channel estimation for free-space continuous-variable secure quantum communication
László Ruppert, Christian Peuntinger, Bettina Heim +6
We investigate estimation of fluctuating channels and its effect on security of continuous-variable quantum key distribution. We propose a novel estimation scheme which is based on…
Stabilization of transmittance fluctuations caused by beam wandering in continuous-variable quantum communication over free-space atmospheric channels
Vladyslav C. Usenko, Christian Peuntinger, Bettina Heim +6
Transmittance fluctuations in turbulent atmospheric channels result in quadrature excess noise which limits applicability of continuous-variable quantum communication. Such fluctua…
Binary Homodyne Detection for Observing Quadrature Squeezing in Satellite Links
Christian R. Müller, Kaushik P. Seshadreesan, Christian Peuntinger +1
Optical satellite links open up new prospects for realizing quantum physical experiments over unprecedented length scales. We analyze and affirm the feasibility of detecting quantu…
More efficient second harmonic generation of whispering gallery modes by selective out-coupling
Luke S. Trainor, Florian Sedlmeir, Christian Peuntinger +1
We demonstrate second harmonic generation (SHG) in an -cut congruent lithium niobate (LN) whispering gallery mode resonator. We first show theoretically that independent control…
High-Dimensional Intra-City Quantum Cryptography with Structured Photons
Alicia Sit, Frédéric Bouchard, Robert Fickler +11
Quantum key distribution (QKD) promises information-theoretically secure communication, and is already on the verge of commercialization. Thus far, different QKD protocols have bee…
Free-space quantum signatures using heterodyne detection
Callum Croal, Christian Peuntinger, Bettina Heim +6
Digital signatures guarantee the authorship of electronic communications. Currently used "classical" signature schemes rely on unproven computational assumptions for security, whil…
Entangling the whole by beam splitting a part
Callum Croal, Christian Peuntinger, Vanessa Chille +4
A beam splitter is a basic linear optical element appearing in many optics experiments and is frequently used as a continuous-variable entangler transforming a pair of input modes…
Quantumness of Gaussian Discord: Experimental Evidence and Role of System-Environment Correlations
Vanessa Chille, Niall Quinn, Christian Peuntinger +5
We provide experimental evidence of quantum features in bi-partite states classified as entirely classical according to a conventional criterion based on the Glauber P-function but…
Atomic mercury vapor inside a hollow-core photonic crystal fiber
Ulrich Vogl, Christian Peuntinger, Nicolas Y. Joly +3
We demonstrate high atomic mercury vapor pressure in a kagomé-style hollow-core photonic crystal fiber at room temperature. After a few days of exposure to mercury vapor the fiber…
Distribution of squeezed states through an atmospheric channel
Christian Peuntinger, Bettina Heim, Christian R. Müller +3
Continuous variable quantum states of light are used in quantum information protocols and quantum metrology and known to degrade with loss and added noise. We were able to show the…
Distributing Entanglement with Separable States
Christian Peuntinger, Vanessa Chille, Ladislav Mišta +5
Like a silver thread, quantum entanglement [1] runs through the foundations and breakthrough applications of quantum information theory. It cannot arise from local operations and c…
Entanglement of Gaussian states and the applicability to quantum key distribution over fading channels
Vladyslav C. Usenko, Bettina Heim, Christian Peuntinger +4
Entanglement properties of Gaussian states of light as well as the security of continuous variable quantum key distribution with Gaussian states in free-space fading channels are s…
Quantum polarization tomography of bright squeezed light
C. R. Muller, B. Stoklasa, C. Gabriel +7
We reconstruct the polarization sector of a bright polarization squeezed beam starting from a complete set of Stokes measurements. Given the symmetry that underlies the polarizatio…