44 citations · 136 across the 10 of their papers we have counts for
10 papers
Accurate and fast identification of minimally prepared bacteria phenotypes using Raman spectroscopy assisted by machine learning
Benjamin Lundquist Thomsen, Jesper B. Christensen, Olga Rodenko +4
The worldwide increase of antimicrobial resistance (AMR) is a serious threat to human health. To avert the spread of AMR, fast reliable diagnostics tools that facilitate optimal an…
Quantum frequency conversion of vacuum squeezed light to bright tunable blue squeezed light and higher-order spatial modes
Hugo Kerdoncuf, Jesper B. Christensen, Mikael Lassen
Quantum frequency conversion, the process of shifting the frequency of an optical quantum state while preserving quantum coherence, can be used to produce non-classical light at ot…
Round-robin differential phase-time-shifting protocol for quantum key distribution: theory and experiment
Kai Wang, Ilaria Vagniluca, Jie Zhang +4
Quantum key distribution (QKD) allows the establishment of common cryptographic keys among distant parties. Many of the QKD protocols that were introduced in the past involve the c…
Cavity-enhanced sum-frequency generation of blue light with near-unity conversion efficiency
Hugo Kerdoncuff, Jesper B. Christensen, Túlio B. Brasil +4
We report on double-resonant highly efficient sum-frequency generation in the blue range. The system consists of a 10-mm-long periodically poled KTP crystal placed in a double-reso…
Unidirectional frequency conversion in microring resonators for on-chip frequency-multiplexed single-photon sources
Mikkel Heuck, Jacob Gade Koefoed, Jesper Bjerge Christensen +4
Microring resonators are attractive for low-power frequency conversion via Bragg-scattering four-wave-mixing due to their comb-like resonance spectrum. However, conversion efficien…
Shape-preserving and unidirectional frequency conversion using four-wave mixing Bragg scattering
Jesper B. Christensen, Jacob G. Koefoed, Bryn A. Bell +2
In this work, we investigate the properties of four-wave mixing Bragg scattering in a configuration that employs orthogonally polarized pumps in a birefringent waveguide. This conf…
Engineering spectrally unentangled photon pairs from nonlinear microring resonators through pump manipulation
Jesper B. Christensen, Jacob G. Koefoed, Karsten Rottwitt +1
The future of integrated quantum photonics relies heavily on the ability to engineer refined methods for preparing the quantum states needed to implement various quantum protocols.…
Spectrally pure heralded single photons by spontaneous four-wave mixing in a fiber: reducing impact of dispersion fluctuations
Jacob G. Koefoed, Søren M. M. Friis, Jesper B. Christensen +1
We model the spectral quantum-mechanical purity of heralded single photons from a photon-pair source based on nondegenerate spontaneous four-wave mixing taking the impact of distri…
Photon-pair generation by non-instantaneous spontaneous four-wave mixing
Jacob G. Koefoed, Jesper B. Christensen, Karsten Rottwitt
We present a general model, based on a Hamiltonian approach, for the joint quantum state of photon pairs generated through pulsed spontaneous four-wave mixing, including nonlinear…
Two-dimensional distributed-phase-reference protocol for quantum key distribution
Davide Bacco, Jesper Bjerge Christensen, Mario A. Usuga Castaneda +4
Quantum key distribution (QKD) and quantum communication enable the secure exchange of information between remote parties. Currently, the distributed-phase-reference (DPR) protocol…