Prosiectau fesul blwyddyn
Crynodeb
In this work we derive a lower bound for the minimum time required to implement a target unitary transformation through a classical timedependent field in a closed quantum system. The bound depends on the target gate, the strength of the internal Hamiltonian and the highest permitted control field amplitude. These findings reveal some properties of the reachable set of operations, explicitly analyzed for a single qubit. Moreover, for fully controllable systems, we identify a lower bound for the time at which all unitary gates become reachable. We use numerical gate optimization in order to study the tightness of the obtained bounds. It is shown that in the single qubit case our analytical findings describe the relationship between the highest control field amplitude and the minimum evolution time remarkably well. Finally, we discuss both challenges and ways forward for obtaining tighter bounds for higher dimensional systems, offering a discussion about the mathematical form and the physical meaning of the bound
Iaith wreiddiol  Saesneg 

Rhif yr erthygl  103015 
Cyfnodolyn  New Journal of Physics 
Cyfrol  19 
Rhif cyhoeddi  10 
Dyddiad arlein cynnar  26 Gorff 2017 
Dynodwyr Gwrthrych Digidol (DOIs)  
Statws  Cyhoeddwyd  20 Hyd 2017 
Ôl bys
Gweld gwybodaeth am bynciau ymchwil 'The roles of drift and control field constraints upon quantum control speed limits'. 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