Project Revision
Workpackage 7 Revised
Although HPLB is the only partner involved in this workpackage, cooperation with UB and NPL will be strongly searched, as stated before.
The chief aims of the work will be to assess a number of important timescalesassociated with the quantum dynamics of the nanomagnet-SQUID system. In particular, we will attempt to determine:
- The relaxation (t1) and dephasing (t2) timescales for the nanomagnet when the SQUID is in a quiescent mode (i.e. when the measurement is ‘OFF’).
- The measurement (tmeas), mixing (tmix) and dephasing (tφ) timescales when the SQUID is in readout mode.
The following milestones will be then pursued:
- M7.1 (month 24). Development of a model Hamiltonian for the combined system-detector, and analysis of the resulting dynamics.
- M7.2 (month 24). Work on existing, generic, system + detector + environment models, taking the charge qubit coupled to a detector as a canonical example. We will attempt to apply our existing results on this subject [see, for example, Barrett and Milburn (cond-mat/0302238), and Schelpe, Kent, Munro and Spiller (quant-ph/0208060)] to the case of magnetic qubits.
- M7.3 (month 36). Within HPLB there is also expertise on state tomographyand entanglement. When modelling and/or experiments progress to the stage where characterisation of quantum states or density matrices is required, this expertise (and existing computer code) can be called upon for measurement analysis, calculation of entanglement, etc.
