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Partial standard quantum process tomography

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Abstract

With the general theory of standard quantum process tomography, we shall develop a scheme to decide an arbitrary matrix element of χ, which is in the Choi matrix representation, in a scalable way. Our observation is that: To decide the diagonal matrix element, one just needs a single measurement; To decide an arbitrary off-diagonal matrix element, we should carry out sixteen measurements. This result is independent of the actual dimension of the system. Compared with the known methods of partial QPT, our scheme does not require any additional resources. It can be applied for the case where a clean ancilla system is not available.

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Authors and Affiliations

  1. Department of Physics, Sichuan University, Chengdu, 610064, China

    Xiaohua Wu & Ke Xu

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  1. Xiaohua Wu
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  2. Ke Xu
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Correspondence to Xiaohua Wu.

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Wu, X., Xu, K. Partial standard quantum process tomography. Quantum Inf Process 12, 1379–1393 (2013). https://doi.org/10.1007/s11128-012-0473-9

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  • DOI: https://doi.org/10.1007/s11128-012-0473-9

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