Yes breve is the same as half and half.
Breve is an espresso based drink that is made by steaming half and half milk.
The Breve is made like cappuccino but instead Breve uses steamed half and half and cappuccino does not.
Breve is made with steamed half and half instead of regular milk because the steamed half and half gives the breve a very creamy foam.
Sometimes breve is called breve latte, cafe breve and sometimes breve coffee.
Breve stands for short in Italian so it's a short coffee.