The puzzling tension between faster-than-light communication and quantum mechanics

We look at a paper by Nicolas Gisin https://arxiv.org/abs/1407.8122 which considers a variation of the superluminal (faster-than-light) communication setup where quantum measurements are made of an entangled pair of qubits. In this paper, an ensemble of qubits is considered, so that a macroscopically large signal is obtained on Bob's side. This reformulates a famous tension that exists between relativity and quantum mechanics, where it is consistent, but for entirely different reasons. Speed of spooky action at a distance https://www.nature.com/articles/natur... Our book which contains the definition of spin Q-functions https://www.cambridge.org/core/books/... https://arxiv.org/abs/2007.14601 #quantummechanics #superluminal #fasterthanlight