Quantum teleportation on a photonic chip

Abstract

Quantum teleportation is a fundamental concept in quantum physics1 that now finds important applications at the heart of quantum technology, including quantum relays2, quantum repeaters3 and linear optics quantum computing4,5. Photonic implementations have largely focused on achieving long-distance teleportation for decoherence-free quantum communication6,7,8. Teleportation also plays a vital role in photonic quantum computing4,5, for which large linear optical networks will probably require an integrated architecture. Here, we report a fully integrated implementation of quantum teleportation in which all key parts of the circuit—entangled state preparation, Bell-state analysis and tomographic state measurement—are performed on a reconfigurable photonic chip. We also show that a novel element-wise characterization method is critical to the mitigation of component errors, a key technique that will become increasingly important as integrated circuits reach the higher complexities necessary for quantum enhanced operation.

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Figure 1: Quantum teleportation and photonic chip realization.
Figure 2: Reconstructed density matrices of the teleported states.
Figure 3: Measured and simulated fidelity of on-chip quantum teleportation.

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Acknowledgements

The authors thank S. Tanzilli for comments on the manuscript. This work was supported by the Engineering and Physical Sciences Research Council (EPSRC projects EP/H03031X/1 and EP/C013956/1, programme grant EP/K034480/1 and platform grant EP/J008052/1), the European Commission project Simulations and Interfaces with Quantum Systems (SIQS), the Royal Society and the European Office of Aerospace Research and Development (EOARD) part of the Air Force Office of Scientific Research (AFOSR). X.-M.J. and W.S.K. are supported by European Commission Marie Curie fellowships (PIIF-GA-2011-300820 and PIEF-GA-2012-331859).

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B.J.M., J.B.S., P.C.H., N.T.-P., N.K.L. and I.A.W. all contributed to designing and setting up the experiment. B.J.M. performed the experiment. J.B.S. designed the FPGA electronics and helped with data taking. D.K. and J.C.G. fabricated the waveguide device. X-M.J., W.S.K., M.B., P.C.H., J.B.S. and B.J.M. all contributed to analysis of the data. B.J.M wrote the manuscript with input from all authors. B.J.S., P.G.R.S. and I.A.W. conceived the work and supervised the project.

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Correspondence to Benjamin J. Metcalf.

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The authors declare no competing financial interests.

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Metcalf, B., Spring, J., Humphreys, P. et al. Quantum teleportation on a photonic chip. Nature Photon 8, 770–774 (2014). https://doi.org/10.1038/nphoton.2014.217

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