Physics – Quantum Physics
Scientific paper
2011-02-16
Phys. Rev. A 83, 062116 (2011)
Physics
Quantum Physics
9 pages, 2 figures
Scientific paper
10.1103/PhysRevA.83.062116
Different methods have been recently put forward and implemented experimentally to inverse engineer the time dependent Hamiltonian of a quantum system and accelerate slow adiabatic processes via non-adiabatic shortcuts. In the "transitionless tracking algorithm" proposed by Berry, shortcut Hamiltonians are designed so that the system follows exactly, in an arbitrarily short time, the approximate adiabatic path defined by a reference Hamiltonian. A different approach is based on designing first a Lewis-Riesenfeld invariant to carry the eigenstates of a Hamiltonian from specified initial to final configurations, again in an arbitrary time, and then constructing from the invariant the transient Hamiltonian connecting these boundary configurations. We show that the two approaches, apparently quite different in form and so far in results, are in fact strongly related and potentially equivalent, so that the inverse-engineering operations in one of them can be reinterpreted and understood in terms of the concepts and operations of the other one. We study as explicit examples the expansions of time-dependent harmonic traps and state preparation of two level systems.
Chen Xi
Muga Gonzalo J.
Torrontegui E.
No associations
LandOfFree
Lewis-Riesenfeld invariants and transitionless tracking algorithm does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Lewis-Riesenfeld invariants and transitionless tracking algorithm, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Lewis-Riesenfeld invariants and transitionless tracking algorithm will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-379672