22 citations · 25 across the 4 of their papers we have counts for
7 papers
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…
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…