The Clauser–Horne–Shimony–Holt (CHSH) experiment is an essential test of nonlocality in quantum mechanics and can be used to validate the principle entanglement. In addition verifying entanglement, measurable CHSH parameter also gauge quality entanglement present a system. measurement Hong–Ou–Mandel (HOM) interference another important fundamental optics that measures indistinguishability pair ...

Relatively few families of Bell inequalities have previously been identified. Some examples are the trivial, CHSH, Imm22, and CGLMP inequalities. This paper presents a large number of new families of tight Bell inequalities for the case of many observables. For example, 44,368,793 inequivalent tight Bell inequalities other than CHSH are obtained for the case of 2 parties each with 10 2-valued o...

Considering generalized concurrence as the criterion of entanglement, we study entanglement properties of superposition of two qutrit coherent states, as a function of their amplitudes. These states may attain maximum entanglement or no entanglement at all, depending on the choice of the parameters involved. The states revealing maximum entanglement also display the maximum violations of the Be...

Abstract The well known Bell experiment with two actors Alice and Bob is considered. First the simple deduction leading to CHSH inequality under local realism reviewed, some arguments from literature are recapitulated. Then I take up certain background themes before enter a discussion of Alice’s analysis situation. An important point that her mind limited by fact Hilbert space in this context t...

In this work, we develop upper bounds on key rates for device-independent quantum distribution (DI-QKD) protocols and devices. We study the reduced $\mathrm{cc}$-squashed entanglement show that it is a convex functional. As result, hull of currently known tighter bound standard Clauser-Horne-Shimony-Holt (CHSH)-based protocol. further provide DI-QKD achievable by any protocol applied to CHSH-ba...

Unlike our basic theories of space and time, quantum mechanics is not a locally causal theory. Moreover, it is widely believed that any hopes of restoring local causality within a realistic theory have been undermined by Bell’s theorem and its supporting experiments. By contrast, we provide a strictly local, deterministic, and realistic explanation for the correlations observed in two such supp...

We report new results regarding a source of polarization entangled photon-pairs created by the process of spontaneous parametric downconversion in two orthogonally oriented, periodically poled, bulk KTiOPO4 crystals (PPKTP). The source emits light colinearly at the non-degenerate wavelengths of 810 nm and 1550 nm, and is optimized for single-mode optical fiber collection and long-distance quant...

High-quality long-distance entanglement is essential for both quantum communication and scalable networks. Entanglement purification to distill high-quality from low-quality in a noisy environment it plays key role repeaters. The previous significant experiments require two pairs of entangled states were demonstrated table-top. Here we propose report high-efficiency using only one pair hyperent...

In this paper, we demonstrate the generation of high-performance entangled photon-pairs in different degrees freedom from a single piece fiber pigtailed periodically poled LiNbO$_3$ (PPLN) waveguide. We utilize cascaded second-order nonlinear optical processes, i.e. second-harmonic (SHG) and spontaneous parametric down conversion (SPDC), to generate photon-pairs. Previously, performance photon ...