Quantum vacuum fluctuations on curved spacetimes cause the emission of entangled pairs. The most remarkable instance of this effect is Hawking radiation from black hole horizons, which can however not be observed in astrophysics. Fortunately, it is possible to recreate the kinematics of waves on curved spacetimes in the laboratory to study horizon emission. Here we investigate and demonstrate...
Abstract: We consider quantum steering by non-Gausssian entangled states. The Reid steering criterion based on the Heisenberg uncertainty relation fails to detect steerability for many categories of such states. Here, we derive a tighter steering criterion using the Robertson–Schrödinger uncertainty relation. We show that our steering condition is able to detect steerability of several classes...
The talk is devoted to discussion of space-time domain finiteness effects for quantum Unruh-DeWitt detector which operates in this domain. We discuss a special renormalization procedure which happens to be different in finite and infinite domain cases. It is demonstrated that, as is typical for renormalization, a new dimensionful parameter appears, having the meaning of detector's recovery...
Driven from the property that electrons in external laser beams can change their spin alignment even perpendicularly to the corresponding photon propagation direction [1,2], we are investigating the full spin-dependent interaction of the electron spin with the photon spin in Compton scattering. We are able to construct dynamics, in which the intrinsic angular momentum of photons and electrons...
Quantum cryptography is a process for developing a perfectly secret encryption key that can be used with any classical encryption system. This paper presents a study of the EPR state protocol [1], the first continuous variable quantum key distribution protocol. We propose an algorithm to this protocol and subsequently its implementation on FPGA (Field-Programmable Gate Array). For the...
Plasma media is quantum mechanical even at high temperature and low density since the Heisenberg uncertainty principle is necessary to keep the electrons from collapsing into the ions, thus it cannot be described in the framework of classical mechanics. Nevertheless the classical molecular dynamics and Monte Carlo simulations became a traditional way of calculation of thermodynamic and...
We identify a phase-space minimum h in space plasmas that connects the energy of correlated plasma particles to an equivalent wave frequency. In particular, while there is no a priori reason to expect a single value of h across plasmas, we find a very similar value of *h ≈ (7.5±0.3)×10^-22 J·s using several independent analytical and statistical methods: 1) solar wind plasma...
The existence of dark matter, or at least some interaction capable of mimicking its effects, is by now established beyond reasonable doubt. There is a huge spectrum of possibilities when it comes to answering the question of what is the nature of dark matter. One interesting possibility is that it is composed of very light scalar or pseudo-scalar particles, sometimes dubbed Weakly Interacting...
The accuracy of clocks has continuously improved up to $10^{-19}$, nowadays [1,2], allowing to probe time-dilation in gravitational fields up to millimeter scale vertically at earth surface. We are investigating the effect of inhomogeneous evolution of the background time on spatially coherent quantum objects. In our study we consider a timed Dicke state excitation of nuclear isomer...
Although many properties of the vortex particles with orbital angular momentum (OAM) $\ell$ can be described within a model of a non-normalized Bessel beam, it does not allow one to go beyond a paraxial approximation, which is crucial for proper study of the spin-orbit effects and for scattering problems in atomic physics, nuclear and high-energy physics, especially when the quantum...
We consider the problem of correctly identifying a malfunctioning quantum device that forms part of a network of N such devices. We first study the case of sources assumed to prepare identical quantum pure states, with the faulty source producing a different anomalous pure state. We show that the optimal probability of successful identification requires a global quantum measurement, and...
The full paper is available on arXiv https://arxiv.org/abs/1710.07212 .
A physical theory comprises a mathematical formalism, which allows for predicting the outcomes of scientific experiments, and some ontological interpretation.In the case of quantum theory, the predictions are probabilistic and often conflict with proposed descriptions of the experiment in terms of classical...
Quantum measurements can lead to results that seem counter intuitive when we attempt to assign a classical meaning to the corresponding quantum observable. This is particularly apparent for joint measurements, which reveal global properties of a system while maintaining ignorance about some local properties. In the pigeonhole paradox, three quantum pigeons placed in two holes appear to each be...
It is well known that certain quantum correlations like quantum steering exhibit a monogamous relationship. In this paper, we exploit the asymmetric nature of quantum steering and show that there exist states which exhibit a kind of polygamous correlation, where the state of one party, Alice, can be steered only by the joint effort of the other two parties, Bob and Charlie. %This is in any way...
The strong experimental evidence for the violation of Bell's inequalities is widely interpreted as the ultimate proof of the impossibility to describe Bell's polarization states of two entangled particles in terms of a local and realistic statistical model of hidden variables in which the observers are free to choose the settings of their measurements. In this paper we note, however, that...
Unambiguous measurements of the energy spectra and of the composition of cosmic rays up to the knee region, around 1 PeV, could provide important clues on their origin, acceleration mechanism, propagation, and composition. Nowadays, due to the extremely low particle rates at these energies, spectral measurements in the knee region are mainly derived from data collected by ground-based...
