Efficient measurement of quantum dynamics via compressive sensing

Details Efficient measurement of quantum dynamics via compressive sensing Efficient measurement of quantum dynamics via compressive sensing

2009-10-28

arxiv.org/abs/0910.5498v2

Phys. Rev. Lett. 106, 100401 (2011)

Physics

Quantum Physics

New title and authors. A new experimental section. Significant rewrite of the theory

Scientific paper

10.1103/PhysRevLett.106.100401

The resources required to characterise the dynamics of engineered quantum systems-such as quantum computers and quantum sensors-grow exponentially with system size. Here we adapt techniques from compressive sensing to exponentially reduce the experimental configurations required for quantum process tomography. Our method is applicable to dynamical processes that are known to be nearly-sparse in a certain basis and it can be implemented using only single-body preparations and measurements. We perform efficient, high-fidelity estimation of process matrices on an experiment attempting to implement a photonic two-qubit logic-gate. The data base is obtained under various decoherence strengths. We find that our technique is both accurate and noise robust, thus removing a key roadblock to the development and scaling of quantum technologies.

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