Temperate winter care for olive, bay leaf and winter jasmine?

Does anyone keep these in a temperate climate. In the past I have kept them with the tropicals, and I am pretty sure they can't take being outside for the winter, but I was considering giving them a partial dormancy in a detached shed. I could rig up a thermostat, pipe heating cable to keep the temp above freezing and supplement the light with a t5? Any thoughts or experiences.

They do ok with the tropicals, but space is limited and they don't do great. Also some fruit or flowers would be nice.

Thanks for any help,
David

I have no personal experience with bay or winter jasmine. However, winter jasmine is hardy to Zone 6, so you could probably keep it with your other hardy bonsai.
Olive is a little more tender. It can stand a touch of frost, but it would ruin the leaves. I keep it outdoors until first frost warning. Then I keep it in the sunporch for a month, where it is cool but above freezing. When the fully hardy trees come in, mid-November, it goes under lights for the winter. Pomegranate and acacia get the same treatment. You can also treat Juniperus squamata the same way, but leave it in the sunporch or whatever, until December.
Iris

don't know the rest but the olives depend on the age and the container, if developing in big containers the roots are protected enough to be ok with light frost, if in bonsai pots keep yours above the 5C and they will do fine, as for dormancy they do need 200/300 hours so you can push them a bit in one season if you wanted, if the leaves would turn yellow and fall because of sudden drop of temperature do not despair, it can catch back all of the sudden, it does take its time though so be patient