Prosiectau fesul blwyddyn
Crynodeb
It is commonly claimed that only Hamiltonians with a spectrum unbounded both above and below can give purely exponential decay. Because such Hamiltonians have no ground state, they are considered unphysical. Here we show that Hamiltonians that are bounded below can give purely exponential decay. This is possible when, instead of looking at the global survival probability, one considers a subsystem only: We show that the reduced state of the subsystem can exhibit a Markovian dynamics, and some (local) observables can decay exponentially. We conclude that purely exponential decay might not be as unphysical as previously thought
Iaith wreiddiol  Saesneg 

Rhif yr erthygl  010103(R) 
Cyfnodolyn  Physical Review A 
Cyfrol  96 
Dynodwyr Gwrthrych Digidol (DOIs)  
Statws  Cyhoeddwyd  20 Gorff 2017 
Ôl bys
Gweld gwybodaeth am bynciau ymchwil 'Positive Hamiltonians can give purely exponential decay'. Gyda’i gilydd, maen nhw’n ffurfio ôl bys unigryw.Prosiectau
 1 Wedi Gorffen

Control characterisation of noisy quantum devices
Burgarth, D. (Prif Ymchwilydd)
Engineering & Physical Sciences Research Council
01 Meh 2015 → 30 Medi 2016
Prosiect: Ymchwil a ariannwyd yn allanol