Efficient Universal Programmable Quantum Measurements
Efficient Universal Programmable Quantum Measurements
A universal programmable detector is a device that can be tuned to perform any desired measurement on a given quantum system, by changing the state of an ancilla. With a finite dimension $d$ for the ancilla only approximate universal programmability is possible, with size $d=f({\ensuremath{\epsilon}}^{\ensuremath{-}1})$ increasing the function of the …