Mattia Walschaers
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View article: Detection of mode-intrinsic quantum entanglement
Detection of mode-intrinsic quantum entanglement Open
Quantum correlations are at the core of quantum information processing and are necessary to achieve a quantum computational advantage. In the context of continuous-variable quantum systems, another necessary resource for quantum advantages…
View article: Joint estimation of position and momentum with arbitrarily high precision using non-Gaussian states
Joint estimation of position and momentum with arbitrarily high precision using non-Gaussian states Open
We address the joint estimation of changes in the position and linear momentum of a quantum particle or, equivalently, changes in the complex field of a bosonic mode. Although these changes are generated by non-commuting operators, we show…
View article: Entanglement routing via passive optics in CV-networks
Entanglement routing via passive optics in CV-networks Open
Large-scale operations in quantum networks require efficient sorting of desired paths between nodes. In this article, we consider entanglement routing, which involves establishing an entanglement link between specific nodes in a large netw…
View article: Erratum: Certification of non-Gaussian States with Operational Measurements [PRX Quantum 2, 020333 (2021)]
Erratum: Certification of non-Gaussian States with Operational Measurements [PRX Quantum 2, 020333 (2021)] Open
View article: Simulability of non-classical continuous-variable quantum circuits
Simulability of non-classical continuous-variable quantum circuits Open
International audience
View article: Detection of mode-intrinsic quantum entanglement
Detection of mode-intrinsic quantum entanglement Open
Quantum correlations are at the core of the power of quantum information and are necessary to reach a quantum computational advantage. In the context of continuous-variable quantum systems, another necessary ressource for quantum advantage…
View article: Metrological detection of entanglement generated by non-Gaussian operations
Metrological detection of entanglement generated by non-Gaussian operations Open
Entanglement and non-Gaussianity are physical resources that are essential for a large number of quantum-optics protocols. Non-Gaussian entanglement is indispensable for quantum-computing advantage and outperforms its Gaussian counterparts…
View article: Gaussian quantum metrology for mode-encoded parameters
Gaussian quantum metrology for mode-encoded parameters Open
Quantum optical metrology aims to identify ultimate sensitivity bounds for the estimation of parameters encoded into quantum states of the electromagnetic field. In many practical applications, including imaging, microscopy, and remote sen…
View article: Exploiting separation-dependent coherence to boost optical resolution
Exploiting separation-dependent coherence to boost optical resolution Open
The problem of resolving pointlike light sources not only serves as a benchmark for optical resolution but also holds various practical applications ranging from microscopy to astronomy. In this paper, we aim to resolve two thermal sources…
View article: Exploiting separation-dependent coherence to boost optical resolution
Exploiting separation-dependent coherence to boost optical resolution Open
The problem of resolving point-like light sources not only serves as a benchmark for optical resolution but also holds various practical applications ranging from microscopy to astronomy. In this research, we aim to resolve two thermal sou…
View article: Practical tests for sub-Rayleigh source discriminations with imperfect demultiplexers
Practical tests for sub-Rayleigh source discriminations with imperfect demultiplexers Open
Quantum-optimal discrimination between one and two closely separated light sources can be theoretically achieved by ideal spatial-mode demultiplexing, simply monitoring whether a photon is detected in a single antisymmetric mode. However, …
View article: Ultra-sensitive separation estimation of optical sources
Ultra-sensitive separation estimation of optical sources Open
Historically, the resolution of optical imaging systems was dictated by diffraction, and the Rayleigh criterion was long considered an unsurpassable limit. In superresolution microscopy, this limit is overcome by manipulating the emission …
View article: Correlation-pattern-based Continuous-variable Entanglement Detection through Neural Networks
Correlation-pattern-based Continuous-variable Entanglement Detection through Neural Networks Open
Entanglement in continuous-variable non-Gaussian states provides irreplaceable advantages in many quantum information tasks. However, the sheer amount of information in such states grows exponentially and makes a full characterization impo…
View article: Ressources non gaussiennes pour les technologies quantiques photoniques
Ressources non gaussiennes pour les technologies quantiques photoniques Open
View article: Application range of crosstalk-affected spatial demultiplexing for resolving separations between unbalanced sources
Application range of crosstalk-affected spatial demultiplexing for resolving separations between unbalanced sources Open
Super resolution is one of the key issues at the crossroads of contemporary quantum optics and metrology. Recently, it was shown that for an idealized case of two balanced sources, spatial mode demultiplexing (SPADE) achieves resolution be…
View article: On Quantum Steering and Wigner Negativity
On Quantum Steering and Wigner Negativity Open
Quantum correlations and Wigner negativity are two important signatures of nonclassicality in continuous-variable quantum systems. In this work, we investigate how both are intertwined in the context of the conditional generation of Wigner…
View article: Emergent complex quantum networks in continuous-variables non-Gaussian states
Emergent complex quantum networks in continuous-variables non-Gaussian states Open
We use complex network theory to study a class of photonic continuous variable quantum states that present both multipartite entanglement and non-Gaussian statistics. We consider the intermediate scale of several dozens of modes at which s…
View article: Practical tests for sub-Rayleigh source discriminations with imperfect\n demultiplexers
Practical tests for sub-Rayleigh source discriminations with imperfect\n demultiplexers Open
Quantum-optimal discrimination between one and two closely separated light\nsources can be achieved by ideal spatial-mode demultiplexing, simply monitoring\nwhether a photon is detected in a single antisymmetric mode. However, we show\ntha…
View article: Resources for Bosonic Quantum Computational Advantage
Resources for Bosonic Quantum Computational Advantage Open
Quantum computers promise to dramatically outperform their classical counterparts. However, the nonclassical resources enabling such computational advantages are challenging to pinpoint, as it is not a single resource but the subtle interp…
View article: Metrological detection of entanglement generated by non-Gaussian operations
Metrological detection of entanglement generated by non-Gaussian operations Open
Entanglement and non-Gaussianity are physical resources that are essential for a large number of quantum-optics protocols. Non-Gaussian entanglement is indispensable for quantum-computing advantage and outperforms its Gaussian counterparts…
View article: On Quantum Steering and Wigner Negativity
On Quantum Steering and Wigner Negativity Open
Quantum correlations and Wigner negativity are two important signatures of nonclassicality in continuous-variable quantum systems. In this work, we investigate how both are intertwined in the context of the conditional generation of Wigner…
View article: Application range of crosstalk-affected spatial demultiplexing for resolving separations between unbalanced sources
Application range of crosstalk-affected spatial demultiplexing for resolving separations between unbalanced sources Open
Superresolution is one of the key issues at the crossroads of contemporary quantum optics and metrology. Recently, it was shown that for an idealized case of two balanced sources, spatial mode demultiplexing (SPADE) achieves resolution bet…
View article: Figure Data "Homodyne Detection of Non-Gaussian Quantum Steering"
Figure Data "Homodyne Detection of Non-Gaussian Quantum Steering" Open
1) Data points + code required to recreate the first 12 figures in the manuscript "Homodyne Detection of Non-Gaussian Quantum Steering". 2) Simulated homodyne detector data used in the final section of the paper.
View article: Figure Data "Homodyne Detection of Non-Gaussian Quantum Steering"
Figure Data "Homodyne Detection of Non-Gaussian Quantum Steering" Open
1) Data points + code required to recreate the first 12 figures in the manuscript "Homodyne Detection of Non-Gaussian Quantum Steering". 2) Simulated homodyne detector data used in the final section of the paper.
View article: Resolving mutually-coherent point sources of light with arbitrary statistics
Resolving mutually-coherent point sources of light with arbitrary statistics Open
International audience
View article: Homodyne Detection of Non-Gaussian Quantum Steering
Homodyne Detection of Non-Gaussian Quantum Steering Open
Quantum correlations are at the core of current developments in quantum technologies. Certification protocols of entanglement and steering, suitable for continuous-variable non-Gaussian states are scarce and generally highly demanding from…
View article: Quantum limits for resolving Gaussian sources
Quantum limits for resolving Gaussian sources Open
We determine analytically the quantum Cram\\'er-Rao bound for the estimation\nof the separation between two point sources in arbitrary Gaussian states. Our\nanalytical expression is valid for arbitrary sources brightness, and it allows\nto…
View article: Resources for bosonic quantum computational advantage
Resources for bosonic quantum computational advantage Open
Quantum computers promise to dramatically outperform their classical counterparts. However, the non-classical resources enabling such computational advantages are challenging to pinpoint, as it is not a single resource but the subtle inter…
View article: Quantum limits for resolving Gaussian sources
Quantum limits for resolving Gaussian sources Open
We determine analytically the quantum Cramér-Rao bound for the estimation of the separation between two point sources in arbitrary Gaussian states. Our analytical expression is valid for arbitrary sources brightness, and it allows to deter…
View article: Maximal entanglement increase with single-photon subtraction
Maximal entanglement increase with single-photon subtraction Open
Entanglement is an indispensable quantum resource for quantum information technology. In continuous-variable quantum optics, photon subtraction can increase the entanglement between Gaussian states of light, but for mixed states the extent…