Quantum Kibble-Zurek mechanism

PRELEGENT: 
Prof. dr hab. Jacek Dziarmaga
DataSeminarium: 
2018-03-12
AfiliacjaPrelegenta: 
Instytut Fizyki UJ
AbstraktSeminarium: 

Ideally, in an adiabatic quantum computation or quantum state preparation, a simple ground state of an initial Hamiltonian is evolved adiabatically to an interesting ground state of a final Hamiltonian. Unfortunately, the simple and the interesting are often different enough to be separated by a quantum phase transition. Due to a vanishing energy gap between the ground state and excited states at the critical point, near the transition the adiabaticity is bound to fail. This failure is quantified by a quantum version of the Kibble-Zurek mechanism (KZM).