Quantum information processing with delocalized qubits under global control.
Conventional quantum computing schemes are incompatible with nanometer-scale "hardware," where the closely packed spins cannot be individually controlled. We report the first experimental demonstration of a global control paradigm: logical qubits delocalize along a spin chain and are addressed via the two terminal spins. Using NMR studies on a three-spin molecule, we implement a globally clocked quantum mirror that outperforms the equivalent swap network. We then extend the protocol to support dense qubit storage and demonstrate this experimentally via Deutsch and Deutsch-Jozsa algorithms.
Department of Materials, Oxford University, Oxford OX1 3PH, United Kingdom. joe.fitzsimons@materials.ox.ac.uk
Joseph
J
Fitzsimons
Li
L
Xiao
Simon C
SC
Benjamin
Jonathan A
JA
Jones