5 papers · 1 filter
Preserving Symmetry: Spontaneous Symmetry Breaking through Decoherence
Sam Kuypers
Solids appear to have localised centres of mass, yet many-body quantum theory describes them using translationally symmetric models that preclude localisation. Conventionally, this…
Restoring Locality: The Heisenberg Picture as a Separable Description of Quantum Theory
Sam Kuypers
Local realism has been the subject of much discussion in modern physics, partly because our deepest theories of physics appear to contradict one another in regard to whether realit…
Measuring time in a timeless universe
Sam Kuypers, Simone Rijavec
Physical systems are usually assumed to evolve relative to an external time parameter, which is problematic because in quantum theory that parameter is not a physical observable. P…
On unorthodox qubits, with an application to the closed timelike curve problem
Samuel Kuypers
In orthodox quantum theory the observables of spacelike separated quantum systems commute. I shall call this the commutation constraint. It severely limits quantum theory's explana…
Everettian relative states in the Heisenberg picture
Samuel Kuypers, David Deutsch
Everett's relative-state construction in quantum theory has never been satisfactorily expressed in the Heisenberg picture. What one might have expected to be a straightforward proc…