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Amplification of cascaded downconversion by reusing photons with a switchable cavity
Alexandre Z. Leger, Samridhi Gambhir, Julien Légère +1
The ability to efficiently produce and manipulate nonclassical states of light is a critical requirement for the development of quantum optical technologies. In recent years, exper…
Phase-stable source of high-quality three-photon polarization entanglement by cascaded downconversion
Zachary M. E. Chaisson, Patrick F. Poitras, Micaël Richard +4
Stable sources of entangled photons are important requirements for quantum communications. In recent years, cascaded downconversion has been demonstrated as an effective method of…
Low-noise heralded single photons from cascaded downconversion
Patrick F. Poitras, Evan Meyer-Scott, Deny R. Hamel
Heralded single photon sources are often implemented using spontaneous parametric downconversion, but their quality can be restricted by optical loss, double pair emission and dete…
Observation of genuine three-photon interference
Sascha Agne, Thomas Kauten, Jeongwan Jin +6
Multiparticle quantum interference is critical for our understanding and exploitation of quantum information, and for fundamental tests of quantum mechanics. A remarkable example o…
Experimental Test of Hyper-Complex Quantum Theories
Lorenzo M. Procopio, Lee A. Rozema, Zi Jing Wong +5
In standard quantum mechanics, complex numbers are used to describe the wavefunction. Although complex numbers have proven sufficient to predict the results of existing experiments…
A strong loophole-free test of local realism
Lynden K. Shalm, Evan Meyer-Scott, Bradley G. Christensen +31
We present a loophole-free violation of local realism using entangled photon pairs. We ensure that all relevant events in our Bell test are spacelike separated by placing the parti…
Certifying the presence of a photonic qubit by splitting it in two
Evan Meyer-Scott, Daniel McCloskey, Klaudia Gołos +6
We present an implementation of photonic qubit precertification that performs the delicate task of detecting the presence of a flying photon without destroying its qubit state, all…
Experimental Superposition of Orders of Quantum Gates
Lorenzo M. Procopio, Amir Moqanaki, Mateus Araújo +7
In a quantum computer, creating superpositions of quantum bits (qubits) in different states can lead to a speed-up over classical computers [1], but quantum mechanics also allows f…
Direct generation of three-photon polarization entanglement
Deny R. Hamel, Lynden K. Shalm, Hannes Hübel +7
Non-classical states of light are of fundamental importance for emerging quantum technologies. All optics experiments producing multi-qubit entangled states have until now relied o…
Time-resolved double-slit experiment with entangled photons
Piotr Kolenderski, Carmelo Scarcella, Kelsey D. Johnsen +7
The double-slit experiment strikingly demonstrates the wave-particle duality of quantum objects. In this famous experiment, particles pass one-by-one through a pair of slits and ar…
Three-photon energy-time entanglement
Lynden K. Shalm, Deny R. Hamel, Zhizhong Yan +3
Entangled quantum particles have correlations stronger than those allowed by classical physics. These correlations are the focus of of the deepest issues in quantum mechanics [1-3]…
Experimental investigation of the uncertainty principle in the presence of quantum memory
Robert Prevedel, Deny R. Hamel, Roger Colbeck +2
Heisenberg's uncertainty principle provides a fundamental limitation on an observer's ability to simultaneously predict the outcome when one of two measurements is performed on a q…
Minimum-error discrimination of entangled quantum states
Yang Lu, Nick Coish, Rainer Kaltenbaek +3
Strategies to optimally discriminate between quantum states are critical in quantum technologies. We present an experimental demonstration of minimum error discrimination between e…
Direct generation of photon triplets using cascaded photon-pair sources
H. Hübel, D. R. Hamel, A. Fedrizzi +3
Non-classical states of light, such as entangled photon pairs and number states, are essential for fundamental tests of quantum mechanics and optical quantum technologies. The most…
Cluster-state quantum computing enhanced by high-fidelity generalized measurements
Devon N. Biggerstaff, Terry Rudolph, Rainer Kaltenbaek +3
We introduce and implement a technique to extend the quantum computational power of cluster states by replacing some projective measurements with generalized quantum measurements (…