Wigner's friend and continuous time evolution of the state of a closed system and the probabilistic, discontinuous collapse of the state of a system upon measurement. Wigner's friend is therefore directly linked to the measurement problem in quantum mechanics with its famous Schrödinger's cat paradox. The thought experiment posits a friend of Wigner in a laboratory and lets him perform a quantum measurement on a physical system (this could be a spin system or also Schrödinger's cat). This system is assumed to be in a superposition of two distinct states, say, state 0 and state 1 (or "dead" and "alive", in the
Unbreakable (Dead or Alive album) Unbreakable (Dead or Alive album) Unbreakable: The Fragile Remixes is an album released by British band Dead or Alive in 2001 which served as a companion piece to their 2000 album "Fragile". "Unbreakable" contains ten tracks which are remixes of "Fragile" songs (some of which were already remakes of past Dead or Alive songs that have been released on their past albums). This record has only been released in Japan from Avex Trax. The album remained an exclusive in this territory until the worldwide release of the Sophisticated Boom Box MMXVI compilation box set in 2016. A double clear vinyl