In this paper, we investigate the critical efficiency of detectors to observe Bell nonlocality using multiple copies maximally entangled two-qubit state carried by a single pair particles, such as hyperentangled states, and product Pauli measurements. It is known that in Clauser-Horne-Shimony-Holt (CHSH) test symmetric detection $82.84%$ can be tolerated for state. We beat enigmatic threshold e...

In this work, there are two parties, Alice on Earth and Bob on the satellite, which initially share an entangled state, and some open problems, which emerge during quantum steering that Alice remotely steers Bob, are investigated. Our analytical results indicate that all entangled pure states and maximally entangled evolution states (EESs) are steerable, and not every entangled evolution state ...

INTRODUCTION Planorbis planorbis (Ram's Horn Snail) is a species of air-breathing freshwater snail, an aquatic gastropod mollusk in the family Planorbidae. It is one of the most common freshwater snails in Europe, occurs in numerous water body types with a preference for standing water such as ponds, swamps or lakes with slow moving or stagnant waters. As typical freshwater invertebrate it is c...

Non-local boxes are hypothetical “machines” that give rise to superstrong non-local correlations, leading to a stronger violation of Bell/CHSH inequalities than is possible within the framework of quantum mechanics. We show how non-local boxes can be used to perform any two-party secure computation. We first construct a protocol for bit commitment and then show how to achieve oblivious transfer...

In a recent preprint James Owen Weatherall has attempted a simple local-deterministic model for the EPR-Bohm correlation and speculated about why his model fails when my counterexample to Bell’s theorem succeeds. Here I bring out the physical, mathematical, and conceptual reasons why his model fails. In particular, I demonstrate why no model based on a tensor representation of the rotation grou...

We propose a possible scheme for generating the maximally entangled mixed state of two atoms symmetrically coupled to a single mode optical cavity field. It is shown that two atoms can not achieve the maximally entangled mixed state in the resonant case. Moreover, they can not violate the Bell-CHSH inequality in the resonant case. In the off-resonant case, the reduced density matrix of two atom...

We investigate the steerability of two-qubit Bell-diagonal states under projective measurements by the steering party. In the simplest nontrivial scenario of two projective measurements, we solve this problem completely by virtue of the connection between the steering problem and the joint-measurement problem. A necessary and sufficient criterion is derived together with a simple geometrical in...

In this contribution to the 2002 Vaxjo conference on the foundations of quantum mechanics and probability, I discuss three issues connected to Bell’s theorem and Bell-CHSH-type experiments: time and the memory loophole, finite statistics (how wide are the error bars, under local realism?), and the question of whether a loophole-free experiment is feasible, a surprising omission on Bell’s list o...

We show that any spatially separated multi-part quantum device demonstrating nonlocality can be used in an untrusted-device protocol for randomness expansion with unconditional quantum security. A consequence is that the noise tolerance for secure randomness expansion only needs to be small enough that it rules out deterministic behavior of the device. This greatly reduces the requirement on im...