Quantum light-matter interactions: sensing, communications, and information processing - 1Virtual room: COPL - 5
|Tuesday, May 26|
QT-1-26-1 / Applications of a quantum pulse gate
* Benjamin Brecht, Paderborn University, Germany
Temporal modes of photonic quantum states are not only a high-dimensional basis for quantum information processing, but find application in quantum metrology and quantum simulation, too. The enabling tool for harnessing the potential of temporal modes is the so-called quantum pulse gate, a device that facilitates projective measurements on arbitrary temporal-mode superpositions. These measurements are a key requisite for applications in quantum state and detector tomography, multi-parameter estimation, and quantum simulation.
QT-1-26-2 / Photonic crystal fibre interfaces for hybrid quantum networks
* Peter J. Mosley, University of Bath, United Kingdom
Quantum networks provide a promising route to advanced quantum technologies for information-processing and communications. However, the wavelengths at which nodes such as trapped ions emit light are incompatible with low-loss transmission in optical fibre, and disparate nodes are also incompatible with one another. Frequency-conversion by fourwave mixing in photonic crystal fibre has the potential to overcome these difficulties. We present recent progress towards frequency-conversion of node wavelengths to the telecommunications band as well as methods to achieve a universal frequency interface by exploiting dispersion engineering in photonic crystal fibre.
QT-1-26-3 / Induced photon correlations by the superposition of two four-wave mixing processes on a photonic chip
* Piotr Roztocki, INRS-EMT, Canada
Michael Kues, Leibniz University Hannover
Yanbing Zhang, INRS-EMT
Christian Reimer, INRS-EMT
Bennet Fischer, INRS-EMT
Benjamin MacLellan, INRS-EMT
Arstan Bisianov, Friedrich Schiller University Jena
Ulf Peschel, Friedrich Schiller University Jena
Brent E. Little, Chinese Academy of Sciences
Sai Chu, City University of Hong Kong
David J. Moss, Swinburne University of Technology
Lucia Caspani, University of Strathclyde
Roberto Morandotti, INRS-EMT
We use two spatial mode families of an integrated microcavity, to demonstrate induced photon correlation linking two different four-wave mixing processes.
QT-1-26-4 / Using an absorptive nonlinearity to measure the effect of an unabsorbed photon
* Josiah Sinclair, University of Toronto, Canada
Because quantum theory lacks a clear underlying ontology, a theoretical description of the history of a particle (like a transmitted photon) is challenging to construct. Additionally, the interaction of light with cold atomic gases gives rise to a rich array of quantum phenomena, including quantum nonlinear optics effects which, aside from a few well-known special cases, (e.g. Jaynes-Cummings model) are not well understood. In the absence of an existing theoretical framework, experiments are needed in order to inspire and constrain new theoretical approaches. In this work, we use an absorptive optical nonlinearity based on saturation to measure how many atoms were excited by a resonant photon transmitted through (and therefore not absorbed by) a cloud of two-level atoms. Counter-intuitively, despite not being absorbed, the effect of a transmitted photon on the atomic ground state population is to excite #+/-# atoms. This is measured by a second, off-resonant beam, which probes the optical depth of the cloud, mapping changes in the ground state population onto phase shifts, which are measured via beat-note interferometry.