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Nat Commun. 2016 Apr 18;7:11339. doi: 10.1038/ncomms11339.

Experimental perfect state transfer of an entangled photonic qubit.

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Quantum Photonics Laboratory, School of Engineering, RMIT University, Melbourne, Victoria 3000, Australia.
School of Physics, The University of Sydney, Sydney, New South Wales 2006, Australia.
Istituto di Fotonica e Nanotecnologie, Consiglio Nazionale delle Ricerche, Piazza Leonardo da Vinci 32, Milano I-20133, Italy.
Dipartimento di Fisica, Politecnico di Milano, Piazza Leonardo da Vinci 32, Milano I-20133, Italy.
Department of Physics, South University of Science and Technology of China, Shenzhen 518055, China.


The transfer of data is a fundamental task in information systems. Microprocessors contain dedicated data buses that transmit bits across different locations and implement sophisticated routing protocols. Transferring quantum information with high fidelity is a challenging task, due to the intrinsic fragility of quantum states. Here we report on the implementation of the perfect state transfer protocol applied to a photonic qubit entangled with another qubit at a different location. On a single device we perform three routing procedures on entangled states, preserving the encoded quantum state with an average fidelity of 97.1%, measuring in the coincidence basis. Our protocol extends the regular perfect state transfer by maintaining quantum information encoded in the polarization state of the photonic qubit. Our results demonstrate the key principle of perfect state transfer, opening a route towards data transfer for quantum computing systems.

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