The strange connection between falling balls and quantum weirdness
A ball tossed into the air follows a path that classical physics can track with confidence. Shrink that…
A universal scheme to self-test any quantum state or measurement
Bell, J. S. On the Einstein-Podolsky-Rosen paradox. Phys. Phys. Fiz. 1, 195 (1964). MathSciNet Google Scholar Bell, J.…
Detecting genuine multipartite entanglement in multi-qubit devices with restricted measurements
Background and notation Let us first state some definitions from graph theory that are relevant for this paper.…
A Century Later, Ramanujan’s Pi Equations Are Helping Physicists Unlock the Secrets of Nature
In 1914, Indian mathematician Srinivasa Ramanujan published a short paper detailing several unusual formulas for calculating the value…
‘Zombie Stars’ Might Be a Beacon in Our Search for Dark Matter
As physicist Cumrun Vafa once told me, puzzles in science often come in pairs, each serving as the…
That Plate You Just Dropped Followed a Weirdly Predictable Rule You’ve Never Heard Of
One innate (perhaps underappreciated) function of physics is to explain and generalize how stuff works in the real…
Learning quantum states of continuous-variable systems
Trace distance The trace distance between two quantum states ρ1 and ρ2 is defined as $${d}_{{\rm{tr}}}(\;{\rho }_{1},{\rho }_{2}):=\frac{1}{2}\|{\rho…
Fermi polarons under strain-induced pseudomagnetic fields
Pseudospin in strained TMDs The spatial symmetry of TMDs dictates that a linearly polarized photon in a state…
Reality Is Too Complex For Any Cosmic Computer Simulation, Study Suggests
How do we know we’re not living in a computer simulation? Is it even possible to tell? For…
Does gravity produce quantum weirdness? Proposal divides physicists
Physicists are questioning whether gravity can produce quantum entanglement between two masses.Credit: David Parker/Science Photo Library The nature…