Breaking the limits of purification: postselection enhances heat-bath algorithmic cooling

Breaking the limits of purification: postselection enhances heat-bath algorithmic cooling

Blog Article

Quantum technologies require pure states, which are often generated by extreme refrigeration.Heat-bath algorithmic cooling is the theoretically optimal refrigeration technique: it shuttles entropy from a multiparticle click here system to a thermal bath, thereby generating a quantum state with a high degree of purity.Here, we show how to surpass this hitherto-optimal technique by taking advantage of a single binary-outcome measurement.Our protocols can create arbitrary numbers of pure quantum states without any residual mixedness by using a recently discovered device known as a quantum switch to put two operations campicon.com in superposition, with postselection certifying the complete purification.