If you're coming from the Lazaridis Centre, take the 11:35am shuttle from QNC to RAC1, and they can return to QNC from RAC1 @ 1:15pm.
A light lunch will be provided.
Nonlocal Correlations between Frequency Entangled Two-Qudit States
Sacha Schwarz, University of Bern
In my talk, I will demonstrate our method to experimentally encode qudits in the energy spectrum of broadband entangled photons generated by parametric down-conversion and detected in coincidence by sum frequency generation. Employing techniques from ultrafast optics to shape fs-laser pulses, the two-photon spectrum is discretized into frequency bins.
Investigating the role of causal order in quantum mechanics has recently revealed that the temporal distribution of events may not be a-priori well-defined in quantum theory. Although this has triggered a growing interest on the theoretical side, the existence of processes without a causal order is an experimental question. In this talk, I will present an optical implementation of an indefinite causal-order structure called quantum switch for two purposes; to execute an algorithm and to verify a causally non-separable process.
I will present our ongoing work on the subject of experimental quantum
communication using continuous variables, which is conducted at the Max
Planck Institute for the Science of Light in Erlangen, Germany. The work
is performed in the Quantum Information Processing group of Dr.
Christoph Marquardt within the division of Prof. Dr. Gerd Leuchs.
My talk will encompass the following topics:
Quantum mechanical or classical interactions between light and matter can demonstrate interesting effects even in simplified models. I will present three such works. The first is a semi-classical theory that corrects the enhancement from a "superchiral" field, by including the magnetic susceptibility term which is usually ignored because of how small it is.
If you're coming from the Lazaridis Centre, take the 11:35am shuttle from QNC to RAC1, and they can return to QNC from RAC1 @ 1:15pm.
A light lunch will be provided.
If you're coming from the Lazaridis Centre, take the 11:35am shuttle from QNC to RAC1, and they can return to QNC from RAC1 @ 1:15pm.
A light lunch will be provided.
Several variants of nonlocal games have been considered in the study of quantum entanglement and nonlocality. In this talk, we shall consider two such variants called quantum-classical games and extended nonlocal games. The players, Alice and Bob, may play the game according to various classes of strategies. An entangled strategy is one in which Alice and Bob use quantum resources in the form of a shared quantum state and sets of measurements. One may ask whether the dimension of the shared state makes a difference in how well the players can perform using an entangled strategy.
Van Dam and Hayden introduced the concept of approximate embezzlement of entanglement. Even if one allows infinite dimensional resource spaces but requires a bipartite tensor product structure of the resource space, perfect embezzlement is still impossible. But in the commuting operator framework perfect embezzlement is possible. We then introduce unitary correlation sets and relate these ideas to the conjectures of Connes and Tsirelson.
I will review our recent activities in continuous variable QKD that aims for the deployment of QKD equipment compatible with current telecom standards and research in satellite QKD that will make it possible to bridge long distances. In optical fibre systems continuous variable quantum cryptography reaches GHz speed and offers efficient integration with known telecommunication techniques, especially in short inner-city or data center links. Sending and receiving components, including quantum random number generators, can be efficiently built in integrated components. Optical free space communication is a reliable means to transmit classical and quantum information. Free space links offer ad-hoc establishment in intra-city communication, air-to-ground or satellite-to-ground scenarios.