1k citations · 4.4k across the 31 of their papers we have counts for
32 papers
Strongly enhanced upconversion in trivalent erbium ions by tailored gold nanostructures: toward high-efficient silicon-based photovoltaics
Jeppe Christiansen, Joakim Vester-Petersen, Søren Roesgaard +6
Upconversion of sub-band-gap photons constitutes a promising way for improving the efficiency of silicon-based solar cells beyond the Shockley-Queisser limit. 1500 to 980 nm upconv…
Analytical model for the intensity dependence of 1500 nm to 980 nm upconversion in Er: a new tool for material characterization
Jeppe Christiansen, Harish Lakhotiya, Emil Eriksen +3
We propose a simplified rate-equation model for the 1500 nm to 980 nm upconversion in Er. The simplifications, based on typical experimental conditions as well as on conclus…
Towards a spin-ensemble quantum memory for superconducting qubits
C. Grezes, Y. Kubo, B. Julsgaard +15
This article reviews efforts to build a new type of quantum device, which combines an ensemble of electronic spins with long coherence times, and a small-scale superconducting quan…
Reaching the quantum limit of sensitivity in electron spin resonance
A. Bienfait, J. J. Pla, Y. Kubo +12
We report pulsed electron-spin resonance (ESR) measurements on an ensemble of Bismuth donors in Silicon cooled at 10mK in a dilution refrigerator. Using a Josephson parametric micr…
Correlation functions and conditioned quantum dynamics in photodetection theory
Qing Xu, Eliska Greplova, Brian Julsgaard +1
Correlations in photodetection signals from quantum light sources are conventionally calculated by application of the source master equation and the quantum regression theorem. In…
Storage and retrieval of microwave fields at the single-photon level in a spin ensemble
C. Grezes, B. Julsgaard, Y. Kubo +13
We report the storage of microwave pulses at the single-photon level in a spin-ensemble memory consisting of NV centers in a diamond crystal coupled to a superconducting…