Another claim, Lewis 2000, is related to the strategy of a believer in the MWI who is offered to play a quantum Russian roulette game.
Since the pioneering experiments showing quantized coherent excitations in electrical circuits [1,2], superconducting circuits including Josephson junctions are playing a fundamental role to demonstrate quantum effects at a mesoscopic level and, remarkably, in quantum information processing.
In the general field of quantum information and computation, quantum walks are playing an increasingly important role in constructing physical models and quantum algorithms.
Also of interest are arguments to the effect that gravity itself may play a role in quantum state reduction (Christian, 2001; Penrose, 2001; also briefly discussed below).
It has never been used as far as I know; I only know of the Heisenberg uncertainty principle, which plays a role in quantum mechanics, to state the precise inequalities of certain pairs of physical properties, but this is probably something else.
Examples are the resistivity quantum, h/e2 (h is Planck's constant and e the electron charge), that appears in a variety of transport experiments and the magnetic flux quantum, h/e, playing an important role in the physics of superconductivity.
Like with a top-performing supercomputer programmed to play chess, a quantum-based cybersecurity system could see the "moves" an anomaly could make later on — and quash it on the spot. .
But it plays a crucial role in quantum computing and cryptography — and, it turns out, in explaining how information encoded in the Hawking radiation gets out of a black hole.
There is an operator, called the Hamiltonian, that plays a special role in quantum theory because the dynamics of a system can be conveniently formulated by tracking its evolution.
On the other hand, reversible logic plays a significant role in quantum-computing.
