From the 1 of 4 linked papers with an AI index.
4 papers
Fermion Doubling in Dirac Quantum Walks
Chaitanya Gupta, Anthony J. Short
The paper investigates fermion doubling and pseudo‑doubling problems in discrete‑spacetime quantum walk models of Dirac particles and introduces a family of quantum walks that avoi…
Can a spin-half particle ever give more than two spots in a Stern-Gerlach experiment? -- the subtle physics of effective Hamiltonians
Noah Linden, Sandu Popescu, Anthony J. Short
We show that a spin-1/2 particle can behave as if it were spin-, and generate spots in a Stern Gerlach measurement (albeit with a smaller gyromagnetic ratio). This arises…
Recurrence Time for Finite Quantum Systems
Chaitanya Gupta, Anthony J. Short
We study the time it takes for all states of a finite quantum system to return simultaneously to their original configuration. In particular, we define the recurrence time for a qu…
The Dirac Vacuum in Discrete Spacetime
Chaitanya Gupta, Anthony J. Short
We consider introducing the Dirac sea in a quantum cellular automata model of fermions in discrete spacetime which approximates the Dirac equation in the continuum limit. However,…