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2010

Reconstructing quantum states efficiently

Cramer, M., Plenio, M. B.

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Quantum state tomography, the ability to deduce the density matrix of a quantum system from measured data, is of fundamental importance for the verification of present and future quantum devices.

It has been realized in systems with few components but for larger systems it becomes rapidly infeasible because the number of quantum measurements and computational resources required to process them grow exponentially in the system size.
Here we show that we can gain an exponential advantage over direct state tomography for quantum states typically realized in nature.
Based on singular value thresholding and matrix product state methods we introduce a state reconstruction scheme that relies only on a linear number of measurements.

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