Abstract We designed and implemented a novel combination of Sagnac-interferometer with Mach–Zehnder interferometer for source polarization-entangled photons. The new versatile configuration does not require multi-wavelength polarization optics, yet it performs good quality phase-stability over wide wavelength range. demonstrate the using only standard commercial optics to experimentally realize...

In Section 3 of his paper [1], Gisin argues that a “careless application of generalized quantum measurements can violate Bell’s inequality even for mixtures of product states.” However, the observed violation of the CHSH inequality is not in fact due to the application of generalized quantum measurements, but rather to a misapplication of the inequality itself — to conditional expectations in w...

The inequalities of Bell, Clauser-Horne-Shimony-Holt (CHSH) and others are shown to be inconsistent with the Fundamental (Universal) Model probability theory when combined physics laws Malus-type. This combination permits modeling all results quantum related CHSH-Aspect-type experiments, while respecting Einstein’s separation principle.

In the past lecture we introduced 3-player variants of both the CHSH and Magic Square games. These have the property that, even though from the point of view of classical players the new games are exactly as hard as the 2-player variants (ω(CHSH2) = ω(CHSH3) and ω(MS2) = ω(MS3)), for quantum players the 3-player variants proved much more challenging: we showed ω∗(CHSH3) = ω(CHSH3) < ω∗(CHSH2) a...

We in this paper study quantum correlations for two neutral spin-particles coupled with a single-mode optical cavity through the usual magnetic interaction. Two-spin entangled states for both antiparallel and parallel spin-polarizations are generated under the photon coherent-state assumption. Based on the quantum master equation we derive the time-dependent quantum correlation of Clauser-Horne...

It is known that the violation of Svetlichny inequality by any three-qubit state described density operator $\rho_{ABC}$ witness genuine non-locality $\rho_{ABC}$. But it not an easy task as problem showing reduces to a complicated optimization problem. Thus, detection may be considered challenging task. Therefore, we have taken different approach and derived lower upper bound expectation value...

Device-independent quantum key distribution (DIQKD) is one of the most challenging tasks in cryptography. The protocols and their security are based on existence Bell inequalities ability to violate them by measuring entangled states. We study entanglement needed for DIQKD two different ways. Our first contribution derivation upper bounds rates CHSH-based terms violation inequality; this sets a...

Quantum coherence and quantum entanglement are two different manifestations of the superposition principle. In this article we show that right choice basis to be used estimate is separable basis. The estimated using Bell does not represent in system, since there a system due states. We first compute qubit mixed states prepared one from computational l1-norm coherence, measured concurrence mixed...