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Any technology for quantum information processing (QIP) must embody within itquantum bits (qubits) and maintain control of their key quantum properties ofsuperposition and entanglement. Typical QIP schemes envisage an array ofphysical systems, such as electrons or nuclei, with each system representing agiven qubit. For adequate control, systems must be distinguishable either byphysical separation or unique frequencies, and their mutual interactions mustbe individually manipulable. These difficult requirements exclude manynanoscale technologies where systems are densely packed and continuouslyinteracting. Here we demonstrate a new paradigm: restricting ourselves toglobal control pulses we permit systems to interact freely and continuously,with the consequence that qubits can become delocalized over the entire device.We realize this using NMR studies of three carbon-13 nuclei in alanine,demonstrating all the key aspects including a quantum mirror, one- andtwo-qubit gates, permutation of densely packed qubits and Deutsch algorithms.Comment: 4 pages, 5 figure

Quantum Information Processing with Delocalized Qubits under Global Control