65 citations · 342 across the 14 of their papers we have counts for
14 papers
Optimised Domain-engineered Crystals for Pure Telecom Photon Sources
Alexander Pickston, Francesco Graffitti, Peter Barrow +4
The ideal photon-pair source for building up multi-qubit states needs to produce indistinguishable photons with high efficiency. Indistinguishability is crucial for minimising erro…
Non-Markovian super-superradiance in a linear chain of up to 100 qubits
Fatih Dinc, Agata M. Brańczyk
We study non-Markovian enhancement effects in the spontaneous emission of a collective excitation in a linear chain of up to 100 qubits coupled to a 1D waveguide. We find that for…
Quantum simulation of Unruh-DeWitt detectors with nonlinear optics
Eugene Adjei, Kevin J. Resch, Agata M. Brańczyk
We propose a method for simulating an Unruh-DeWitt detector, coupled to a 1+1-dimensional massless scalar field, with a suitably-engineered nonlinear interaction. In this…
Direct generation of tailored pulse-mode entanglement
Francesco Graffitti, Peter Barrow, Alexander Pickston +2
Photonic quantum technology increasingly uses frequency encoding to enable higher quantum information density and noise resilience. Pulsed time-frequency modes (TFM) represent a un…
Non-Hermitian engineering for brighter broadband pseudothermal light
Nicolás Quesada, Eugene Adjei, Ramy El-Ganainy +1
We show that non-Hermitian engineering can play a positive role in quantum systems. This is in contrast to the widely accepted notion that optical losses are a foe that must be eli…
Broadband pseudothermal states with tunable spectral coherence generated via nonlinear optics
Nicolás Quesada, Agata M. Brańczyk
It is well known that the reduced state of a two-mode squeezed vacuum state is a thermal state---i.e. a state whose photon-number statistics obey a geometric distribution. More exo…
Exact Markovian and non-Markovian time dynamics in waveguide QED: collective interactions, bound states in continuum, superradiance and subradiance
Fatih Dinc, İlke Ercan, Agata M. Brańczyk
We develop a formalism for modelling exact time dynamics in waveguide quantum electrodynamics (QED) using the real-space approach. The formalism does not assume any specific config…
Design Considerations for High-purity Heralded Single Photon Sources
Francesco Graffitti, Jérémy Kelly-Massicotte, Alessandro Fedrizzi +1
When building a parametric downconversion photon-pair source with spectrally separable photons, e.g. for making high-purity heralded single photons, two practical issues must be ac…
Gaussian functions are optimal for waveguided nonlinear-quantum-optical processes
Nicolás Quesada, Agata M. Brańczyk
Many nonlinear optical technologies require the two-mode spectral amplitude function that describes them---the \emph{joint spectral amplitude} (JSA)---to be separable. We prove tha…
Hong-Ou-Mandel Interference
Agata M. Brańczyk
This article is a detailed introduction to Hong-Ou-Mandel (HOM) interference, in which two photons interfere on a beamsplitter in a way that depends on the photons' distinguishabil…
Pure down-conversion photons through sub-coherence length domain engineering
Francesco Graffitti, Dmytro Kundys, Derryck T. Reid +2
Photonic quantum technology relies on efficient sources of coherent single photons, the ideal carriers of quantum information. Heralded single photons from parametric down-conversi…
Thermal States and Wave Packets
Aurélia Chenu, Agata M. Brańczyk, John E. Sipe
The classical and quantum representations of thermal equilibrium are strikingly different, even for free, non-interacting particles. While the first involves particles with well-de…
First-order decomposition of thermal light in terms of a statistical mixture of pulses
Aurélia Chenu, Agata M. Brańczyk, J. E. Sipe
We investigate the connection between thermal light and coherent pulses, constructing mixtures of single pulses that yield the same first-order, equal-space-point correlation funct…
Self-calibrating tomography for multi-dimensional systems
Nicolás Quesada, Agata M. Brańczyk, Daniel F. V. James
We present a formalism for self-calibrating tomography of arbitrary dimensional systems. Self-calibrating quantum state tomography was first introduced in the context of qubits, an…