Journal
NPJ QUANTUM INFORMATION
Volume 4, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/s41534-018-0063-5
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Funding
- Australian Research Council (ARC) [DP130100135, DP160100619, DE180100070]
- Erasmus Mundus [NANOPHI 2013 5659/002-001]
- Alexander von Humboldt-Stiftung
- Australia-Germany Joint Research Co-operation Scheme of Universities Australia
- German Academic Exchange Service [57376641]
- Deutsche Forschungsgemeinschaft [SZ 276/12-1, BL 574/13-1]
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Quantum information systems are on a path to vastly exceed the complexity of any classical device. The number of entangled qubits in quantum devices is rapidly increasing, and the information required to fully describe these systems scales exponentially with qubit number. This scaling is the key benefit of quantum systems, however it also presents a severe challenge. To characterize such systems typically requires an exponentially long sequence of different measurements, becoming highly resource demanding for large numbers of qubits. Here we propose and demonstrate a novel and scalable method for characterizing quantum systems based on expanding a multi- photon state to larger dimensionality. We establish that the complexity of this new measurement technique only scales linearly with the number of qubits, while providing a tomographically complete set of data without a need for reconfigurability. We experimentally demonstrate an integrated photonic chip capable of measuring two- and three-photon quantum states with statistical reconstruction fidelity of 99.71%.
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