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Experimental quantum multimeter and one-qubit fingerprinting

Du, Jiangfeng and Zou, Ping and Peng, Xinhua and Oi, Daniel K. L. and Kwek, L. C. and Oh, C. H. and Ekert, Artur (2006) Experimental quantum multimeter and one-qubit fingerprinting. Physical Review A, 74 (4). -. ISSN 1094-1622

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Abstract

There has been much recent effort to realize quantum devices in many different physical systems. Among them, nuclear magnetic resonance (NMR) has been the first to demonstrate nontrivial quantum algorithms with small numbers of qubits and hence is a prototype for the key ingredients needed to build quantum computers. An important building block in many quantum applications is the scattering circuit, which can be used as a quantum multimeter to perform various quantum information processing tasks directly without recourse to quantum tomography. We implement in NMR a three-qubit version of the multimeter and also demonstrate a single-qubit fingerprinting.