Nicolás Quesada
YOU?
Author Swipe
View article: Near-optimal decomposition of unitary matrices using phase masks and the discrete Fourier transform
Near-optimal decomposition of unitary matrices using phase masks and the discrete Fourier transform Open
Universal multiport interferometers (UMIs) have emerged as a key tool for performing arbitrary linear transformations on optical modes, enabling precise control over the state of light in essential applications of classical and quantum inf…
View article: Ultrashort-pulse-pumped, single-mode type-0 squeezers in lithium niobate nanophotonics
Ultrashort-pulse-pumped, single-mode type-0 squeezers in lithium niobate nanophotonics Open
We present design principles for ultrashort-pulse, type-0 phase-matched optical parametric amplifiers to generate and measure spectrally pure degenerate squeezed light. We consider a fundamental signal (second-harmonic) mode at 2090 (1045)…
View article: Strategies for generating separable photon triplets in waveguides and ring resonators
Strategies for generating separable photon triplets in waveguides and ring resonators Open
Photon triplet sources exhibit non-Gaussian features, a key property for applications in quantum computing and quantum information. However, spectral correlations can limit the performance and detection efficiency of these systems. Motivat…
View article: What's my phase again? Computing the vacuum-to-vacuum amplitude of quadratic bosonic evolution
What's my phase again? Computing the vacuum-to-vacuum amplitude of quadratic bosonic evolution Open
Quadratic bosonic Hamiltonians and their associated unitary transformations form a fundamental class of operations in quantum optics, modelling key processes such as squeezing, displacement, and beam-splitting. Their Heisenberg-picture dyn…
View article: Simulating lossy and partially distinguishable quantum optical circuits: theory, algorithms and applications to experiment validation and state preparation
Simulating lossy and partially distinguishable quantum optical circuits: theory, algorithms and applications to experiment validation and state preparation Open
To understand quantum optics experiments, we must perform calculations that consider the principal sources of noise, such as losses, spectral impurity and partial distinguishability. In both discrete and continuous variable systems, these …
View article: Ultrashort-pulse-pumped, single-mode type-0 squeezers in lithium niobate nanophotonics
Ultrashort-pulse-pumped, single-mode type-0 squeezers in lithium niobate nanophotonics Open
We present design principles for ultrashort-pulse, type-0 phase-matched optical parametric amplifiers to generate and measure spectrally pure degenerate squeezed light. We consider a fundamental signal (second-harmonic) mode at 2090 (1045)…
View article: Etching properties of PIN-PMN-PT and its integration in electro-optic phase modulators
Etching properties of PIN-PMN-PT and its integration in electro-optic phase modulators Open
We investigate the etching characteristics of PIN-PMN-PT crystals, exploring various wet etching solutions, reactive ion etching gases, and ion beam etching. The etch rate and surface roughness are systematically measured for each method. …
View article: Accurate Unsupervised Photon Counting from Transition Edge Sensor Signals
Accurate Unsupervised Photon Counting from Transition Edge Sensor Signals Open
We compare methods for signal classification applied to voltage traces from transition-edge sensors (TES) which are photon-number resolving detectors fundamental for accessing quantum advantages in information processing, communication and…
View article: Linear Cross-Entropy Certification of Quantum Computational Advantage in Gaussian Boson Sampling
Linear Cross-Entropy Certification of Quantum Computational Advantage in Gaussian Boson Sampling Open
Validation of quantum advantage claims in the context of Gaussian boson sampling (GBS) currently relies on providing evidence that the experimental samples genuinely follow their corresponding ground truth, i.e., the theoretical model of t…
View article: Riemannian optimization of photonic quantum circuits in phase and Fock space
Riemannian optimization of photonic quantum circuits in phase and Fock space Open
We propose a framework to design and optimize generic photonic quantum circuits composed of Gaussian objects (pure and mixed Gaussian states, Gaussian unitaries, Gaussian channels, Gaussian measurements) as well as non-Gaussian effects suc…
View article: Etching Properties of PIN-PMN-PT and its Integration in Electro-Optic Phase Modulators
Etching Properties of PIN-PMN-PT and its Integration in Electro-Optic Phase Modulators Open
We investigate the etching characteristics of PIN-PMN-PT crystals, exploring various wet etching solutions, reactive ion etching gases, and ion beam etching. The etch rate and surface roughness are systematically measured for each method. …
View article: Etching Properties of PIN-PMN-PT and its Integration in Electro-Optic Phase Modulators
Etching Properties of PIN-PMN-PT and its Integration in Electro-Optic Phase Modulators Open
We investigate the etching characteristics of PIN-PMN-PT crystals, exploring various wet etching solutions, reactive ion etching gases, and ion beam etching. The etch rate and surface roughness are systematically measured for each method. …
View article: Matrix decompositions in quantum optics: Takagi/Autonne, Bloch–Messiah/Euler, Iwasawa, and Williamson
Matrix decompositions in quantum optics: Takagi/Autonne, Bloch–Messiah/Euler, Iwasawa, and Williamson Open
In this tutorial, we summarize four important matrix decompositions commonly used in quantum optics, namely the Takagi/Autonne, Bloch–Messiah/Euler, Iwasawa, and Williamson decompositions. The first two of these decompositions are speciali…
View article: Quantum-Inspired Classical Algorithm for Graph Problems by Gaussian Boson Sampling
Quantum-Inspired Classical Algorithm for Graph Problems by Gaussian Boson Sampling Open
We present a quantum-inspired classical algorithm that can be used for graph-theoretical problems, such as finding the densest k subgraph and finding the maximum weight clique, which are proposed as applications of a Gaussian boson sampler…
View article: Gain-induced group delay in spontaneous parametric down-conversion
Gain-induced group delay in spontaneous parametric down-conversion Open
Strongly-driven nonlinear optical processes such as spontaneous parametric down-conversion and spontaneous four-wave mixing can produce multiphoton nonclassical beams of light which have applications in quantum information processing and s…
View article: Linear cross-entropy certification of quantum computational advantage in Gaussian Boson Sampling
Linear cross-entropy certification of quantum computational advantage in Gaussian Boson Sampling Open
Validation of quantum advantage claims in the context of Gaussian Boson Sampling (GBS) currently relies on providing evidence that the experimental samples genuinely follow their corresponding ground truth, i.e., the theoretical model of t…
View article: Matrix decompositions in Quantum Optics: Takagi/Autonne, Bloch-Messiah/Euler, Iwasawa, and Williamson
Matrix decompositions in Quantum Optics: Takagi/Autonne, Bloch-Messiah/Euler, Iwasawa, and Williamson Open
In this note we summarize four important matrix decompositions commonly used in quantum optics, namely the Takagi/Autonne, Bloch-Messiah/Euler, Iwasawa, and Williamson decompositions. The first two of these decompositions are specialized v…
View article: Perfect pulsed inline twin-beam squeezers
Perfect pulsed inline twin-beam squeezers Open
Perfect inline squeezers are both spectrally pure and have identical input and output temporal modes, allowing one to squeeze an arbitrary input quantum state in the sole input mode on which the device acts, while the quantum states of any…
View article: Beyond the parametric approximation: pump depletion, entanglement and squeezing in macroscopic down-conversion
Beyond the parametric approximation: pump depletion, entanglement and squeezing in macroscopic down-conversion Open
We study the dynamics of the pump mode in the down-conversion Hamiltonian using the cumulant expansion method, perturbation theory, and the full numerical simulation of systems with a pump mean photon number of up to one hundred thousand. …
View article: Classical models may be a better explanation of the Jiuzhang 1.0 Gaussian Boson Sampler than its targeted squeezed light model
Classical models may be a better explanation of the Jiuzhang 1.0 Gaussian Boson Sampler than its targeted squeezed light model Open
Recently, Zhong et al. [1, 2] performed landmark Gaussian boson sampling experiments with up to 144 modes using threshold detectors. The authors claim to have achieved quantum computational advantage with the implementation of these experi…
View article: Custom Nonlinearity Profile for Integrated Quantum Light Sources
Custom Nonlinearity Profile for Integrated Quantum Light Sources Open
Heralded single-photon sources are a fundamental building block for optical quantum technologies. These sources need to be unfiltered and integrated to have good scalability and avoid unnecessary losses. To attain this goal, it is necessar…
View article: The Complexity of Bipartite Gaussian Boson Sampling
The Complexity of Bipartite Gaussian Boson Sampling Open
Gaussian boson sampling is a model of photonic quantum computing that has attracted attention as a platform for building quantum devices capable of performing tasks that are out of reach for classical devices. There is therefore significan…
View article: Classical models are a better explanation of the Jiuzhang 1.0 Gaussian Boson Sampler than its targeted squeezed light model
Classical models are a better explanation of the Jiuzhang 1.0 Gaussian Boson Sampler than its targeted squeezed light model Open
This repository contains the data used to obtain the different results of the paper "Classical models are a better explanation of the Jiuzhang 1.0 Gaussian Boson Sampler than its targeted squeezed light model" (https://arxiv.org/abs/2207.1…
View article: Classical models are a better explanation of the Jiuzhang 1.0 Gaussian Boson Sampler than its targeted squeezed light model
Classical models are a better explanation of the Jiuzhang 1.0 Gaussian Boson Sampler than its targeted squeezed light model Open
This repository contains the data used to obtain the different results of the paper "Classical models are a better explanation of the Jiuzhang 1.0 Gaussian Boson Sampler than its targeted squeezed light model" (https://arxiv.org/abs/2207.1…
View article: Classical models are a better explanation of the Jiuzhang 1.0 Gaussian Boson Sampler than its targeted squeezed light model
Classical models are a better explanation of the Jiuzhang 1.0 Gaussian Boson Sampler than its targeted squeezed light model Open
This repository contains the data used to obtain the different results of the paper "Classical models are a better explanation of the Jiuzhang 1.0 Gaussian Boson Sampler than its targeted squeezed light model" (https://arxiv.org/abs/2207.1…
View article: Waveguided sources of consistent, single-temporal-mode squeezed light: the good, the bad, and the ugly
Waveguided sources of consistent, single-temporal-mode squeezed light: the good, the bad, and the ugly Open
We study theoretically how the brightness of pumps, with fixed profiles, affects the temporal mode structure of squeezed states generated by fixed parametric waveguided sources. We find that the temporal modes of these squeezed states can …
View article: Riemannian optimization of photonic quantum circuits in phase and Fock space
Riemannian optimization of photonic quantum circuits in phase and Fock space Open
We propose a framework to design and optimize generic photonic quantum circuits composed of Gaussian objects (pure and mixed Gaussian states, Gaussian unitaries, Gaussian channels, Gaussian measurements) as well as non-Gaussian effects suc…
View article: Classical models may be a better explanation of the Jiuzhang 1.0 Gaussian Boson Sampler than its targeted squeezed light model
Classical models may be a better explanation of the Jiuzhang 1.0 Gaussian Boson Sampler than its targeted squeezed light model Open
Recently, Zhong et al. performed landmark Gaussian boson sampling experiments with up to 144 modes using threshold detectors. The authors claim to have achieved quantum computational advantage with the implementation of these experiments, …
View article: Custom nonlinearity profile for integrated quantum light sources
Custom nonlinearity profile for integrated quantum light sources Open
Heralded single-photon sources are a fundamental building block for optical quantum technologies. These sources need to be unfiltered and integrated to have good scalability and avoid unnecessary losses. To attain this goal, it is necessar…
View article: Universal quantum circuits for quantum chemistry
Universal quantum circuits for quantum chemistry Open
Universal gate sets for quantum computing have been known for decades, yet no universal gate set has been proposed for particle-conserving unitaries, which are the operations of interest in quantum chemistry. In this work, we show that con…