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Controlling Photon Entanglement with Mechanical Rotation
Marion Cromb, Sara Restuccia, Graham M. Gibson +3
Understanding quantum mechanics within curved spacetime is a key stepping stone towards understanding the nature of spacetime itself. Whilst various theoretical models have been de…
Measuring Optical Activity with Unpolarised Light: Ghost Polarimetry
S. Restuccia, G. M. Gibson, L. Cronin +1
Quantifying the optical chirality of a sample requires the precise measurement of the rotation of the plane of linear polarisation of the transmitted light. Central to this notion…
Revealing and concealing entanglement with non-inertial motion
Marko Toroš, Sara Restuccia, Graham M. Gibson +4
Photon interference and bunching are widely studied quantum effects that have also been proposed for high precision measurements. Here we construct a theoretical description of pho…
Imaging with quantum states of light
Paul-Antoine Moreau, Ermes Toninelli, Thomas Gregory +1
The production of pairs of entangled photons simply by focusing a laser beam onto a crystal with a non-linear optical response was used to test quantum mechanics and to open new ap…
Imaging Through Noise With Quantum Illumination
Thomas Gregory, Paul-Antoine Moreau, Ermes Toninelli +1
The contrast of an image can be degraded by the presence of background light and sensor noise. To overcome this degradation, quantum illumination protocols have been theorised (Sci…
Photon bunching in a rotating reference frame
Sara Restuccia, Marko Toros, Graham M. Gibson +3
Although quantum physics is well understood in inertial reference frames (flat spacetime), a current challenge is the search for experimental evidence of non-trivial or unexpected…
Light, the universe, and everything -- 12 Herculean tasks for quantum cowboys and black diamond skiers
Girish Agarwal, Roland Allen, Iva Bezdekova +29
The Winter Colloquium on the Physics of Quantum Electronics (PQE) has been a seminal force in quantum optics and related areas since 1971. It is rather mindboggling to recognize ho…
Nondestructive Measurement of Orbital Angular Momentum for an Electron Beam
Hugo Larocque, Frédéric Bouchard, Vincenzo Grillo +6
Free electrons with a helical phase front, referred to as "twisted" electrons, possess an orbital angular momentum (OAM) and, hence, a quantized magnetic dipole moment along their…
Measuring an electron beam's orbital angular momentum spectrum
incenzo Grillo, Amir H. Tavabi, Federico Venturi +12
Quantum complementarity states that particles, e.g. electrons, can exhibit wave-like properties such as diffraction and interference upon propagation. \textit{Electron waves} defin…
Video recording true single-photon double-slit interference
Reuben S. Aspden, Miles J. Padgett, Gabriel C. Spalding
As normally used, no commercially available camera has a low-enough dark noise to directly produce video recordings of double-slit interference at the photon-by-photon level, becau…
Testing for entanglement with periodic coarse-graining
Daniel S. Tasca, Łukasz Rudnicki, Reuben S. Aspden +3
Continuous variables systems find valuable applications in quantum information processing. To deal with an infinite-dimensional Hilbert space, one in general has to handle large nu…
Divergence of an orbital-angular-momentum-carrying beam upon propagation
Miles J. Padgett, Filippo M. Miatto, Martin Lavery +2
There is recent interest in the use of light beams carrying orbital angular momentum (OAM) for creating multiple channels within free-space optical communication systems. One limit…
Higher-dimensional orbital angular momentum based quantum key distribution with mutually unbiased bases
Mhlambululi Mafu, Angela Dudley, Sandeep Goyal +7
We present an experimental study of higher-dimensional quantum key distribution protocols based on mutually unbiased bases, implemented by means of photons carrying orbital angular…
High-dimensional quantum cryptography with twisted light
Mohammad Mirhosseini, Omar S. Magaña-Loaiza, Malcolm N. O'Sullivan +6
Quantum key distributions (QKD) systems often rely on polarization of light for encoding, thus limiting the amount of information that can be sent per photon and placing tight boun…
Interface between path and OAM entanglement for high-dimensional photonic quantum information
Robert Fickler, Radek Lapkiewicz, Marcus Huber +3
Photonics has become a mature field of quantum information science, where integrated optical circuits offer a way to scale the complexity of the setup as well as the dimensionality…
Two-photon optics of Bessel-Gaussian modes
Melanie McLaren, Jacquiline Romero, Miles J. Padgett +2
In this paper we consider geometrical two-photon optics of Bessel-Gaussian modes generated in spontaneous parametric down-conversion of a Gaussian pump beam. We provide a general t…
Direct Measurement of a 27-Dimensional Orbital-Angular-Momentum State Vector
Mehul Malik, Mohammad Mirhosseini, Martin P. J. Lavery +3
The measurement of a quantum state poses a unique challenge for experimentalists. Recently, the technique of "direct measurement" was proposed for characterizing a quantum state in…
Optimising the use of detector arrays for measuring intensity correlations of photon pairs
Daniel S. Tasca, Matthew P. Edgar, Frauke Izdebski +2
Intensity correlation measurements form the basis of many experiments based on spontaneous parametric down-conversion. In the most common situation, two single-photon avalanche dio…
Characterization of high-dimensional entangled systems via mutually unbiased measurements
D. Giovannini, J. Romero, J. Leach +3
Mutually unbiased bases (MUBs) play a key role in many protocols in quantum science, such as quantum key distribution. However, defining MUBs for arbitrary high-dimensional systems…
EPR-based ghost imaging using a single-photon-sensitive camera
Reuben S. Aspden, Daniel S. Tasca, Robert W. Boyd +1
Correlated-photon imaging, popularly known as ghost imaging, is a technique whereby an image is formed from light that has never interacted with the object. In ghost imaging experi…
Influence of Atmospheric Turbulence on Optical Communications using Orbital Angular Momentum for Encoding
Mehul Malik, Malcolm O'Sullivan, Brandon Rodenburg +5
We describe an experimental implementation of a free-space 11-dimensional communication system using orbital angular momentum (OAM) modes. This system has a maximum measured OAM ch…
Imaging high-dimensional spatial entanglement with a camera
Matthew P. Edgar, Daniel S. Tasca, Frauke Izdebski +6
The light produced by parametric down-conversion shows strong spatial entanglement that leads to violations of EPR criteria for separability. Historically, such studies have been p…
Bounds and optimisation of orbital angular momentum bandwidths within parametric down-conversion systems
F. M. Miatto, D. Giovannini, J. Romero +3
The measurement of high-dimensional entangled states of orbital angular momentum prepared by spontaneous parametric down-conversion can be considered in two separate stages: a gene…
Experimental high-dimensional two-photon entanglement and violations of generalised Bell inequalities
Adetunmise C. Dada, Jonathan Leach, Gerald S. Buller +2
Quantum entanglement plays a vital role in many quantum information and communication tasks. Entangled states of higher dimensional systems are of great interest due to the extende…