A5042614012- Quantum Information and Cryptography
- Semiconductor Quantum Structures and Devices
- Semiconductor Lasers and Optical Devices
- Quantum Computing Algorithms and Architecture
- Quantum Dots Synthesis And Properties
- Near-Field Optical Microscopy
- Nanowire Synthesis and Applications
- Quantum and electron transport phenomena
- Quantum optics and atomic interactions
- GaN-based semiconductor devices and materials
- Photonic and Optical Devices
Leibniz University Hannover
2019-2022
Chinese Academy of Sciences
2014
National Center for Mathematics and Interdisciplinary Sciences
2014
Abstract Single photon sources are key components for quantum technologies such as communication, computing and metrology. A challenge towards the realization of global networks transmission losses in optical fibers. Therefore, single required to emit at low-loss telecom wavelength bands. However, an ideal source has yet be discovered. Here, we review recent progress realizing sources. We start with emission based on atomic ensembles spontaneous parametric down conversion, then focus...
GaAs quantum dots (QDs) grown by local droplet etching (LDE) have been studied extensively in recent years. The LDE method allows for high crystallinity, as well precise control of the density, morphology, and size QDs. These properties make QDs an ideal candidate single photon entangled sources at short wavelengths (<800 nm). For technologically important telecom wavelengths, however, it is still unclear whether can be realized. Controlling growth conditions does not enable shifting...
Fermions, as another major class of quantum particles, could be taken carriers for information processing beyond spins or bosons. In this work, we consider the fermionic generalization one-way computation model and find that can also simulated with fermions. detail, using n → 2n encoding scheme from a spin system to fermion system, introduce cluster state, then universal computing power state is demonstrated explicitly. Furthermore, show created only by measurements on at most four modes...
Epitaxially grown semiconductor quantum dots are promising candidates for pure single photon and polarization-entangled pair emission. Excellent optical properties can typically be ensured only if these so-called “artificial atoms” buried deep inside the host material. Quantum close to surface prone charge carrier fluctuations trap states on surface, degrading brightness, coherence, stability of We report high-purity emission [g(2)(0) = 0.016 ± 0.015] GaAs/AlGaAs that were 20 nm below...
Linear optical quantum Fredkin gate can be applied to computing and multi-user communication network. In the existing linear scheme, two single photon detectors (SPDs) are used heralding success of while they have no count. But analysis results show that for non-perfect SPD lower detector efficiency, higher heralded rate by this scheme. We propose an improved designing a new scheme with auxiliary qubit only one SPD, in which detection efficiency detector, gate. The also work efficiently...