8 papers
Identical, independent quantum weak measurements violate objective realism
Tomasz Rybotycki, Tomasz BiaÅecki, Josep Batle +4
We demonstrate violation of objective realism in quantum world using unconstrained weak measurements. Instead of limited Leggett-Garg approach with artificial bounds on the observe…
Testing time order and Leggett-Garg inequalities with noninvasive measurements on public quantum computers
Tomasz Rybotycki, Tomasz BiaÅecki, Josep Batle +4
We demonstrate the first violation of the Leggett-Garg inequality and time-order noninvariance on public quantum computers using genuine noninvasive measurements. By gathering suff…
Device-independent prepare-and-prepare bipartite null witness dimension test with a single joint measurement
Josep Batle, Tomasz BiaÅecki, Tomasz Rybotycki +1
We propose a device-independent null witness dimensionality test with bipartite measurements and input from two separate parties. The dimension is determined from the rank of the m…
Cross-platform certification of the qubit space with a minimal number of parameters
Tomasz Rybotycki, Tomasz BiaÅecki, Josep Batle +2
We demonstrate a determinant dimension witness of a qubit space. Our test has a minimal number of independent parameters. We achieve it by mapping the Bloch sphere -rotation…
Violation of no-signaling on a public quantum computer
Tomasz Rybotycki, Tomasz BiaÅecki, Josep Batle +1
No-signaling is a consequence of the no-communication theorem that states that bipartite systems cannot transfer information unless a communication channel exists. It is also a by-…
Efficient discrimination between real and complex quantum theories
Josep Batle, Tomasz BiaÅecki, Tomasz Rybotycki +2
We improve the test to show the impossibility of a quantum theory based on real numbers by a larger ratio of complex-to-real bound on a Bell-type parameter. In contrast to previous…