Efficient Ansatz for Quantum Process Tomography

Tuesday, October 8, 2019 11:00 am - 11:00 am EDT

Luke Govia Raytheon-BBN Technologies

As candidate quantum processors increase both in size and fidelity, so too does the need for robust verification and validation of their operation. Unfortunately, the resource requirements for standard quantum process tomography scales exponentially with the number of qubits, and even for small scale systems, the experimental resource requirements make full tomography very challenging in practice. To circumvent this, we present an ansatz to describe an arbitrary quantum process on a multi-qubit system that only requires characterization of two-qubit processes, which can be done efficiently. Along with its theoretical and computational implementation, we present the results of the application of our ansatz to characterization of a device consisting of three superconducting qubits.

This material is based upon work supported by the U.S. Army Research Office under Contract No: W911NF-14-C-0048. Any opinions, findings and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the U.S. Army Research Office.

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