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Alexandre Orthey (Center for Theoretical Physics, Polish Academy of Sciences)Poster
Weak measurements can give us partial information about the state of a quantum system with a ``partial collapse'' of the wave function. As in every practical measurement, this is done by partially entangling the system of interest with a measurement apparatus, followed by an unavoidable discard of the state of the system. Although the quantum logic gates to perform that on qubits are...
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Vicente P Soloviev (Universidad Politécnica de Madrid)Poster
Variational quantum algorithms (VQAs) (Cerezo et al. [2021]) are hybrid approaches between classical and quantum computation, where a classical optimizer proposes parameter configurations for a quantum parametric circuit which is iteratively measured. Each measured solution is assessed according to a cost function that evaluates the energy of the system, which is sought to be optimized. The...
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Mr Guillem Llodra (IFISC)Poster
Quantum reservoir computing is a neuro-inspired machine learning approach harnessing the rich dynamics of quantum systems to solve temporal tasks. It has gathered attention for its suitability for NISQ devices, for easy and fast trainability, and for potential quantum advantage. Although several types of systems have been proposed as quantum reservoirs, differences arising from particle...
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Alejandro Vivas-Viaña (Departamento de Física Teórica de la Materia Condensada and Condesed Matter Physics Center (IFIMAC), Universidad Autónoma de Madrid)Poster
Common wisdom suggests that, in order to entangle two quantum emitters, it is desirable that these have identical natural frequencies, since this facilitates cross talk between them and enables the type of collective dynamics that leads to entanglement [1]. However, the fabrication of quantum emitters with identical properties is a significant challenge in solid state physics.
In this work,...
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Sourav Kesharee Sahoo (Ph.D Scholar)
Emergence of classicality from quantum mechanics, a hotly debated topic, has had no satisfactory resolution so far. Various approaches including decoherence and gravitational interactions have been suggested. In the present work, the Schrödinger-Newton model is used to study the role of semi-classical self-gravity in the evolution of massive spin-1/2 particles in a Stern-Gerlach experiment....
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Xoel Sixto (UVigo)Poster
Quantum key distribution (QKD) is a technique for sharing a secret key between two separated communicating parties, usually referred to as Alice and Bob. When employed in conjunction with the one-time-pad encryption scheme, QKD provides information-theoretically secure communications, regardless of the future progress of classical or quantum technologies. In recent years, the field of QKD has...
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Anita Camillini (University of Minho, INL - International Iberian Nanotechnology Laboratory)Poster
Quantum research is focused on using quantum systems to perform computations and tasks that are impossible with a classical approach. These quantum computational advantages are a result of exponential differences in the resources needed for classical and quantum systems to perform the same task. However, quantum information processing offers more than just computational power. There is a...
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50. Exploring indefinite causal order effects in thermal devices powered by generalized measurementsPedro Dieguez (International Centre for Theory of Quantum Technologies (ICTQT))Poster
A quantum-controlled device may produce a scenario in which two general quantum operations can be performed in such a way that it is not possible to associate a definite order for their application. Such an indefinite causal order can be explored to produce nontrivial effects in quantum thermal devices. In this poster, we discuss a measurement-powered thermal device that consists of...
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Alberto RolandiPoster
Landauer's principle gives a fundamental limit to the thermodynamic cost of erasing information. Its saturation requires a reversible isothermal process, and hence infinite time. We develop a finite-time version of Landauer's principle for a bit encoded in the occupation of a single fermionic mode, which can be strongly coupled to a reservoir. By solving the exact non-equilibrium dynamics, we...
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Paula García-Molina (Institute of Fundamental Physics)Poster
This work discusses the solution of partial differential equations using matrix-product states (MPS). The study focuses on the search for the lowest eigenstates of a Hamiltonian equation, for which five algorithms are introduced: imaginary time evolution, steepest gradient descent, an improved gradient descent, an implicitly restarted Arnoldi method and density-matrix renormalization group...
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Dr Andrés Ulibarrena (Heriot-Watt University)Poster
One of the goals within the quantum information community is the development of robust and reliable quantum networks. On those networks we will be able to perform quantum communication protocols and quantum computations. As quantum network technology becomes commonplace, the need for certification tools will arise to answer questions regarding the properties of the network.
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Our goal is to... -
Guillermo F Peñas Fernández (Instituto de Física Fundamental CSIC)Poster
Quantum state transfer is a key operation for quantum information processing. The original pitch-and-catch protocols rely on flying qubits or single photons with engineered wavepacket shapes to achieve a deterministic, fast and high-fidelity transfer. Yet, these protocols overlook two important factors, namely, the distortion of the wavepacket during the propagation and non-Markovian effects...
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Javier Rivera Dean (Instituto de Ciencias Fotónicas (ICFO))Poster
Light-matter entanglement plays a fundamental role in many applications of quantum information science. Thus, finding processes where it can be observed is an important task. Here, we address this matter by theoretically investigating the entanglement between light, and electrons generated in above-threshold ionization (ATI) process, where an input strong-laser field rips out an electron from...
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Somayeh Mehrabankar (Departamento de Física Teórica and IFIC, Universidad de Valencia-CSIC, 46100 Burjassot (Valencia), Spain)Poster
Assuming an open quantum system consisting of two coupled oscillators, we investigate the evolution of quantum correlations and purity in an equilibrium thermal environment with regard to the Born-Markov approximation. We assume squeezed vacuum state as the initial state of the system and study the effect of repulsive and attraction interaction on the correlations. In addition, their...
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Berta Casas Font (Barcelona Supercomputing Center)Poster
Quantum Machine Learning is the field that aims to integrate machine learning into quantum computation. In the past years, some works have shown that we can naturally generate one-dimensional Fourier series with a simple supervised quantum learning model. However, there is a lack of explanation of such models for generating Fourier series of larger data-dimension. In this work, we provide a...
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Dr Elías Combarro (University of Oviedo)Poster
Quantum abstract detecting systems (QADS) provide a common framework to address detection problems in quantum computers [1]. A particular QADS family, that of combinatorial QADS [2], has been proved to be useful for decision problems on eigenvalues or phase estimation methods. In this work, we consider functional QADS, which not only have interesting theoretical properties (intrinsic detection...
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Sebastián V. Romero (Tecnalia Research & Innovation)Poster
We introduce a simple algorithm that efficiently computes tensor products of Pauli matrices. This is done by tailoring the calculations to this specific case, which allows to avoid unnecessary calculations. The strength of this strategy is benchmarked against state-of-the-art techniques, showing a remarkable acceleration. As a side product, we provide an optimized method for one key calculus...
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Adria Labay Mora (Institute for Cross Disciplinary Physics and Complex Systems (IFISC) UIB-CSIC)Poster
Algorithms for associative memory typically rely on a network of many connected units. The prototypical example is the Hopfield model, whose generalizations to the quantum realm are mainly based on open quantum Ising models. We propose a realization of associative memory with a single driven-dissipative non-linear quantum oscillator exploiting its infinite degrees of freedom in phase space....
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Antonio Ruiz-Molero (University of Minho)Poster
Weak values [1] and the Kirkwood-Dirac (KD) quasiprobability distribution [5, 3], recently connected with one another, have been associated with both foundational issues in quantum theory as well as advantages in quantum metrology. For example, the nonclassicality of weak values and KD distributions has been linked to quantum advantage in metrology [2] and quantification of quantum information...
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JULIO ALBERTO LÓPEZ-GÓMEZ Not SuppliedPoster
Solving complex optimization problems remains, to this day, an area of intense research and a challenge for professionals in science, engineering, and industry. This context motivates the emergence of methods that efficiently deal with very diverse problems: multiobjective, with a large number of constraints, nonlinear or with uncertainty, among others. Bio-inspired and metaheuristic...
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Alberto Pedro Manzano HerreroPoster
In this talk I present the Real Quantum Amplitude Estimation algorithm, an extension of Quantum Amplitude Estimation which is sensitive to the sign of the amplitude. Moreover, I propose an extension of the methodology which recovers the complex amplitude.
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Antón Rodríguez Otero (TNO, TU Delft master student)Poster
Connecting quantum computers to a quantum network opens a wide array of new applications, such as securely performing computations on distributed data sets. Near-term quantum networks will however remain noisy and hence correctness and security of protocols is not guaranteed.
Therefore, we consider noisy protocols with imperfect shared entangled states. This paper takes a first step in...
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Álvaro Navarrete Rodriguez (Universidad de Vigo)Poster
Most security proofs of quantum key distribution (QKD) disregard the effect of information leakage from the users’ devices, and, thus, do not protect against Trojan-horse attacks (THAs). In a THA, the eavesdropper injects strong light into the QKD apparatuses, and then analyzes the back-reflected light to learn information about their internal setting choices. Only a few recent works consider...
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Javier OscaPoster
Linear optical elements in combination with post-selection can be used to perform general quantum computation [1]. SOQCS is a C++ library (with a Python port) [2] aimed to simulate optical circuits for light modeled as Fock wavepackets. The objectives of the library are to work as a design tool of optical circuits and to provide a mean to calculate the effect of different imperfections in...
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