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View article: Tracing Information Flow from Open Quantum Systems
Tracing Information Flow from Open Quantum Systems Open
Open quantum systems are highly relevant, both for practical applications as well as for fundamental questions about the nature of information and its transfer, encompassing for example decoherence and memory effects. Quantum mechanics int…
View article: Unmasking the polygamous nature of quantum nonlocality
Unmasking the polygamous nature of quantum nonlocality Open
Quantum mechanics imposes limits on the statistics of certain observables. Perhaps the most famous example is the uncertainty principle. Similar trade-offs also exist for the simultaneous violation of multiple Bell inequalities. In the sim…
View article: Valid and efficient entanglement verification with finite copies of a quantum state
Valid and efficient entanglement verification with finite copies of a quantum state Open
Detecting entanglement in multipartite quantum states is an inherently probabilistic process, typically with a few measured samples. The level of confidence in entanglement detection quantifies the scheme’s validity via the probability tha…
View article: Deep-learning-based radio-frequency side-channel attack on quantum key distribution
Deep-learning-based radio-frequency side-channel attack on quantum key distribution Open
Quantum key distribution (QKD) is a technique that allows two distant parties to distribute and share a common secret, which then can be used as a cryptographic key. While mathematical proofs verify the security of perfectly implemented sy…
View article: Deep-Learning-Based Radio-Frequency Side-Channel Attack on Quantum Key Distribution
Deep-Learning-Based Radio-Frequency Side-Channel Attack on Quantum Key Distribution Open
Quantum key distribution (QKD) protocols are proven secure based on fundamental physical laws, however, the proofs consider a well-defined setting and encoding of the sent quantum signals only. Side channels, where the encoded quantum stat…
View article: Analysing quantum systems with randomised measurements
Analysing quantum systems with randomised measurements Open
Measurements with randomly chosen settings determine many important properties of quantum states without the need for a shared reference frame or calibration. They naturally emerge in the context of quantum communication and quantum comput…
View article: Datasets for Deep Learning Based Radio Frequency Side-Channel Attack on Quantum Key Distribution
Datasets for Deep Learning Based Radio Frequency Side-Channel Attack on Quantum Key Distribution Open
The dataset contains measurements of radio-frequency electromagnetic emissions from a home-built sender module for BB84 quantum key distribution. The goal of these measurements was to evaluate information leakage through this side-channel.…
View article: Datasets for Deep Learning Based Radio Frequency Side-Channel Attack on Quantum Key Distribution
Datasets for Deep Learning Based Radio Frequency Side-Channel Attack on Quantum Key Distribution Open
The dataset contains measurements of radio-frequency electromagnetic emissions from a home-built sender module for BB84 quantum key distribution. The goal of these measurements was to evaluate information leakage through this side-channel.…
View article: Quantum key Distribution with a Hand-Held Sender Unit
Quantum key Distribution with a Hand-Held Sender Unit Open
Living the revolution: Quantum key distribution over free-space channels offers a multitude of different application scenarios---provided it can be combined with conventional communication systems. This study presents a miniaturized sender…
View article: Valid and efficient entanglement verification with finite copies of a quantum state
Valid and efficient entanglement verification with finite copies of a quantum state Open
Detecting entanglement in multipartite quantum states is an inherently probabilistic process, typically with a few measured samples. The level of confidence in entanglement detection quantifies the scheme's validity via the probability tha…
View article: Quantum Key Distribution with a Hand-held Sender Unit
Quantum Key Distribution with a Hand-held Sender Unit Open
Quantum key distribution (QKD) is a crucial component for truly secure communication, which enables to analyze leakage of information due to eavesdropper attacks. While impressive progress was made in the field of long-distance implementat…
View article: Open-Source LDPC Error Correction for QKD
Open-Source LDPC Error Correction for QKD Open
International audience
View article: Cooperation and dependencies in multipartite systems
Cooperation and dependencies in multipartite systems Open
We propose an information-theoretic quantifier for the advantage gained from cooperation that captures the degree of dependency between subsystems of a global system. The quantifier is distinct from measures of multipartite correlations de…
View article: Tracing Information Flow from Open Quantum Systems in Integrated Waveguides
Tracing Information Flow from Open Quantum Systems in Integrated Waveguides Open
Quantum simulation is one of the core areas in the development of quantum technologies. Among the various simulation platforms, integrated waveguides have proven to be a powerful and versatile tool. One important aspect of quantum simulati…
View article: Tracing Information Flow from Open Quantum Systems
Tracing Information Flow from Open Quantum Systems Open
Open quantum systems are highly relevant, both for practical applications as well as for fundamental questions about the nature of information and its transfer, encompassing for example decoherence and memory effects. Quantum mechanics int…
View article: Gaussian state entanglement witnessing through lossy compression
Gaussian state entanglement witnessing through lossy compression Open
We propose a method to witness entanglement between two continuous-variable\nsystems in a Gaussian state. Its key ingredient is a local lossy state transfer\nfrom the original spatially separated systems onto two spatially separated\nqubit…
View article: Quadratic Entanglement Criteria for Qutrits
Quadratic Entanglement Criteria for Qutrits Open
The problem of detecting non-classical correlations of states of many qudits is incomparably more involved than in a case of qubits. The reason is that for qubits we have a convenient description of the system by the means of the well-stud…
View article: Quadratic Entanglement Criteria for Qutrits
Quadratic Entanglement Criteria for Qutrits Open
The problem of detecting non-classical correlations of states of many qudits is incomparably more involved than in the case of qubits.One reason is that for qubits we have a convenient description of the system by the means of the well-stu…
View article: Measurements of Nonlocal Variables and Demonstration of the Failure of the Product Rule for a Pre- and Postselected Pair of Photons
Measurements of Nonlocal Variables and Demonstration of the Failure of the Product Rule for a Pre- and Postselected Pair of Photons Open
We report the first implementation of the von Neumann instantaneous measurements of nonlocal variables, which becomes possible due to technological achievements in creating hyperentangled photons. Tests of reliability and of the nondemolit…
View article: Universality of local weak interactions and its application for interferometric alignment
Universality of local weak interactions and its application for interferometric alignment Open
The modification of the effect of interactions of a particle as a function of its preselected and postselected states is analyzed theoretically and experimentally. The universality property of this modification in the case of local interac…
View article: Efficient quantum state analysis and entanglement detection
Efficient quantum state analysis and entanglement detection Open
Entanglement is one of the most fascinating features of quantum theory, as it fundamentally distinguishes quantum systems from classical systems. It not only might play a role in natural processes, but provides an especially powerful resou…
View article: Measurement-Disturbance Tradeoff Outperforming Optimal Cloning
Measurement-Disturbance Tradeoff Outperforming Optimal Cloning Open
One of the characteristic features of quantum mechanics is that every measurement that extracts information about a general quantum system necessarily causes an unavoidable disturbance to the state of this system. A plethora of different a…
View article: Weak value beyond conditional expectation value of the pointer readings
Weak value beyond conditional expectation value of the pointer readings Open
It is argued that a weak value of an observable is a robust property of a\nsingle pre- and post-selected quantum system rather than a statistical\nproperty. During an infinitesimal time a system with a given weak value affects\nother syste…
View article: Publisher’s Note: Multipartite Entanglement Detection with Minimal Effort [Phys. Rev. Lett. <b>117</b>, 210504 (2016)]
Publisher’s Note: Multipartite Entanglement Detection with Minimal Effort [Phys. Rev. Lett. <b>117</b>, 210504 (2016)] Open
This corrects the article DOI: 10.1103/PhysRevLett.117.210504.
View article: An Improved Experiment to Determine the ‘Past of a Particle’ in the Nested Mach–Zehnder Interferometer
An Improved Experiment to Determine the ‘Past of a Particle’ in the Nested Mach–Zehnder Interferometer Open
We argue that the modification proposed by Li et al. [Chin. Phys. Lett. 32,\n050303 (2015)] to the experiment of Danan et al. [Phys. Rev. Lett. 111, 240402\n(2013)] does not test the past of the photon as characterised by local weak\ntrace…
View article: Multipartite Entanglement Detection with Minimal Effort
Multipartite Entanglement Detection with Minimal Effort Open
Certifying entanglement of a multipartite state is generally considered a demanding task. Since an N qubit state is parametrized by 4^{N}-1 real numbers, one might naively expect that the measurement effort of generic entanglement detectio…
View article: How long does it take to obtain a physical density matrix?
How long does it take to obtain a physical density matrix? Open
The statistical nature of measurements alone easily causes unphysical estimates in quantum state tomography. We show that multinomial or Poissonian noise results in eigenvalue distributions converging to the Wigner semicircle distribution …
View article: Genuine Multipartite Entanglement without Multipartite Correlations
Genuine Multipartite Entanglement without Multipartite Correlations Open
Nonclassical correlations between measurement results make entanglement the essence of quantum physics and the main resource for quantum information applications. Surprisingly, there are n-particle states which do not exhibit n-partite cor…
View article: Systematic Errors in Current Quantum State Tomography Tools
Systematic Errors in Current Quantum State Tomography Tools Open
Common tools for obtaining physical density matrices in experimental quantum state tomography are shown here to cause systematic errors. For example, using maximum likelihood or least squares optimization to obtain physical estimates for t…