Demonstration of Robust Quantum Gate Tomography Via Randomized Benchmarking
Journal Article - Open Access
Raytheon BBN Technologies Cambridge United States
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Typical quantum gate tomography protocols struggle with a self-consistency problem the gate operation cannot be reconstructed without knowledge of the initial state and final measurement, but such knowledge cannot be obtained without well-characterized gates. A recently proposed technique, known as randomized benchmarking tomography RBT, sidesteps this self-consistency problem by designing experiments to be insensitive to preparation and measurement imperfections. We implement this proposal in a superconducting qubit system, using a number of experimental improvements including implementing each of the elements of the Clifford group in single atomic pulses and custom control hardware to enable large overhead protocols. We show a robust reconstruction of several single-qubit quantum gates, including a unitary outside the Clifford group. We demonstrate that RBT yields physical gate reconstructions that are consistent with fidelities obtained by RB.
- Quantum Theory and Relativity