Session Overview |
Light-matter Interactions at the quantum limit: atoms, molecules and photons - Bloc 1Room: International 2 |
Date: Tuesday, June 05 |
08:25 |
A Primary Standard for Radiometry based on Quantum Nonlinear Optics
Main Author: Samuel Lemieux Organization: University of Ottawa, Canada We use vacuum fluctuations, in conjunction with photon pair generation, to recover the quantum efficiency of a spectrometer over a wide spectral range without the use of an external calibration reference. Thus, this setup qualifies as a primary source of light for use in radiometry. |
08:40 |
Simulations and Dynamics of Wavepackets in Cyclic Quantum Systems
Main Author: Farshad Nejadsattari Organization: university of Ottawa, Canada A large number of phenomena in condensed matter physics are properly understood by exploring their topological features. For instance, in cyclic molecules (CM), such as Ozone and Benzene, both transport features and preferred bonding are determined by the electrons spatial and spin distributions. Here, we report on the realization and implementation of a photonic cyclic quantum walk (CQW) capable of simulating such quantum systems. In particular, the presence of specific topological phases is observed by considering the relevant dispersion relations. Quantum simulations of artificial CMs consisting of six identical atoms are reported. |
08:55 |
Theoretical limits to efficiency and indistinguishibility of pulse-triggered quantum dot-cavity single photon sources
Main Author: Chris Gustin Organization: Queen's University, Canada Quantum dots coupled to optical cavities provide an excellent source of pulse-triggered single-photons of high indistinguishability and efficiency, and recent work has focused on the fundamental limits to these figures-of-merit in the presence of intrinsic sources of decoherence such as electron-phonon scattering. Often neglected, however, is the effect of the excitation pulse, which can degrade the single-photon purity via multiple photon emission events. We investigate the extent to which these events can be suppressed by engineering the pulse and cavity parameters of the source, and derive a master equation which captures important memory effects associated with the pulse interaction with photon and phonon reservoirs. |
09:10 |
What is the best heralding-arm frequency filter bandwidth for a given heralded single photon source?
Main Author: Luke Helt Organization: Queen's University, Canada We consider frequency-filtered heralding of single photons from frequency-correlated biphoton states, and develop equations for the trade-off between heralding success probability and heralded photon purity as a function of filter width. |
09:25 |
Real-time spectral characterization of a photon pair source using a chirped supercontinuum seed
Main Author: Jennifer Erskine Organization: University of Ottawa, Canada We perform joint spectral intensity measurements by studying stimulated four wave mixing in a birefringent fiber photon pair source. Seeding the process with a chirped supercontinuum beam, measurements are acquired in as little as 5 s. |
09:40 |
Single photon switching at ultrafast timescales
Main Author: Connor Kupchak Organization: University of Ottawa, Canada We present a technique capable of efficiently switching single photons at ultrafast timescales using nonlinear techniques inside a simple, commercially available single-mode fibre. Photonic tools of this functionality will be beneficial for highbandwidth quantum communication networks and interfacing with ultrafast quantum processes. |
09:55 |
Noise contributions in on-chip four-photon states
Main Author: Mehedi Islam Organization: INRS-EMT, Canada We present the compact and scalable realization of four-photon time-bin entangled states using a quantum frequency comb generated from an integrated photonic chip. We show how noise affects higher-order spontaneous emissions for this state. |
10:10 |
Can SPDC pumped by spatially incoherent light produce entangled photons?
Main Author: Robert Fickler Organization: University of Ottawa, Canada Spontaneous parametric down-conversion (SPDC) is the workhorse of most quantum optical experiments generating entanglement, a key feature of quantum physics. The underlying mechanism to generate transverse position-momentum entangled photons is often heuristically explained by assuming a common birth zone of the photon pair and transverse momentum conservation. In our work, we investigate the properties of photon pairs generated by a true incoherent pump beam from an LED and try to answer the question whether these arguments are valid independent of the transverse spatial coherence of the pump. |