Using entanglement in photonic qubit measurements
Geoff J. Pryde, Jeremy L. O’Brien, Andrew G. White, Timothy C. Ralph, Stephen D. Bartlett, Howard M. Wiseman · Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE · 2005
Two-qubit entangling gates allow the realization of new types of generalized quantum measurement. We discuss, and use photonic systems to demonstrate, two instances of this: two-qubit entangling measurements realizing superior discrimination of locally prepared two-qubit quantum states relative to what is achievable with local measurements and classical communication; and nondestructive weak measurements with postselection, leading to quantum weak values.