Experimental Demonstration of Quantum State Multi-meter and One-qubit   Fingerprinting in a Single Quantum Device
  We experimentally demonstrate in NMR a quantum interferometric multi-meter for extracting certain properties of unknown quantum states without resource to quantum tomography. It can perform direct state determinations, eigenvalue/eigenvector estimations, purity tests of a quantum system, as well as the overlap of any two unknown quantum states. Using the same device, we also demonstrate one-qubit quantum fingerprinting. 
Jiangfeng Du, Ping Zou, Daniel K. L. Oi, Xinhua Peng, L. C. Kwek, C.   H. Oh, Artur Ekert