Free-space photonic quantum link and chiral quantum optics

Free Space Optics System: Performance and Link Availability

Free Space Optics (FSO) is a telecommunications technology that transmits data in the form of optical signals across the air and, as such, can be considered as a wireless (line-of-sight) transmission system; this technology is capable of handling data rates at the Gbps level, does not require licensing, and can be deployed at one-fifth of the cost of fiber; also, the narrow beams employed in th...

Florian Kaiser Photonic entanglement engineering for quantum information applications and fundamental quantum optics

The aim of this thesis is to develop sources of photonic entanglement to study both quantum networkingtasks and some of the foundations of quantum physics. To this end, three high-performance sourcesare developed, each of them taking extensively advantage of standard telecom fibre optics components.The first source generates polarization entanglement via deterministic pair separatio...

Free-space quantum key distribution

Quantum cryptography was introduced in the mid1980s [1] as a new method for generating the shared, secret random number sequences, or cryptographic keys, that are used in crypto-systems to provide communications security. The appeal of quantum cryptography is that its security is based on laws of Nature, in contrast to existing methods of key distribution that derive their security from the per...

Free-Space Quantum Key Distribution

Quantum key distribution is the most advanced technology to arise from the emerging field of quantum information. In fact, a few companies (MaqiQ Technologies and id Quantique) already offer commercial quantum key distribution products. But why so much excitement over QKD when our standard techniques serve just fine? Well the thing is that our standard techniques are safe only under certain ass...

Quantum Optics