We investigate the dynamics of quantum correlations (QC) under effects reservoir memory, as a resource for information and computation tasks. Quantum two-qubit systems are used implementing teleportation successfully, investigating how fidelity, violation Bell-CHSH inequality, steering entanglement connected with each other influence noisy environments. Both Markovian non-Markovian channels con...

Entanglement in quantum mechanics contradicts local realism and is a manifestation of quantum nonlocality. Its presence can be detected through the violation of Bell, or Clauser-Horne-Shimony-Holt (CHSH) inequalities. Paradigmatic quantum systems provide examples of both, nonentangled and entangled states. Here, we consider a minimal complexity setup consisting of six Majorana zero modes. We fi...

" To estimate the value of the CHSH inequality, we accumulate n = 3,016 successive entanglement events over the period of about one month. "

Understanding the characteristics of a quantum systems when affected by noise is one of the biggest challenges for quantum technologies. The general Pauli error channel is an important lossless channel for quantum communication. In this work we consider the effects of a Pauli channel on a pure four-qubit state and simulate the Pauli channel experimentally by studying the action on polarization ...

We report on an electronic coincidence detection circuit for quantum photonic applications implemented a field-programmable gate array (FPGA), which records each the time separation between events coming from single-photon detectors. achieve window as narrow 500 ps with series of optimizations readily-available and affordable FPGA development board. Our implementation allows real-time visualiza...

Device-independent quantum key distribution (DIQKD) provides the strongest form of secure exchange, using only input-output statistics devices to achieve information-theoretic security. Although basic security principles DIQKD are now well-understood, it remains a technical challenge derive reliable and robust bounds for advanced protocols that go beyond previous results based on violations CHS...

We propose the first correct special-purpose quantum circuits for preparation of Bell diagonal states (BDS), and implement them on IBM Quantum computer, characterizing testing complex aspects their correlations in full parameter space. Among proposed, one involves only two bits but requires adapted tomography routines handling classical parallel. The entire class is generated, several character...

This thesis describes the development of a high-quality source of single-mode fibercoupled polarization-entangled photon pairs based on a collinear spontaneous parametric down-conversion process in a bidirectionally pumped periodically-poled potassium titanyl phosphate (PPKTP) crystal inside a polarization Sagnac interferometer at communication wavelength (1.56 im). A two-photon quantum interfe...

The no-signaling constraint on bi-partite correlations is reviewed. It is shown that in order to obtain non-trivial Bell-type inequalities that discern no-signaling correlations from more general ones, one must go beyond considering expectation values of products of observables only. A new set of nontrivial no-signaling inequalities is derived which have a remarkably close resemblance to the CH...

Abstract At first sight, the use of an everywhere positive Wigner function as a probability density to perform stochastic simulations in quantum optics seems equivalent introduction local hidden variables, thus preventing any violation Bell inequalities. However, because difference between symmetrically and normally ordered operators, some trajectories can imply negative intensities, despite me...