Calibrating two-qubit gates via robust phase estimation
ORAL
Abstract
Robust phase estimation (RPE) is a Heisenberg-limited characterization protocol for learning the phases of quantum gate operations. Unlike many other similar techniques, RPE requires neither ancillae qubits nor highly accurate state preparation and measurement. Additionally, the computational requirements of RPE are minimal, needing nothing more complex than inverse trigonometric functions. To date, RPE has been used for single-qubit gate characterization and calibration. We extend RPE for two qubits, showing that it may be used to learn the phase for any standard two-qubit gate (e.g., CNOT, CPHASE, Molmer-Sorensen, SWAP, cross-resonance, etc.). We provide both numerical and experimental results.
*Sandia National Labs is managed and operated by National Technology and Engineering Solutions of Sandia, LLC, a subsidiary of Honeywell International, Inc., for the U.S. Dept. of Energy’s National Nuclear Security Administration under contract DE-NA0003525. The views expressed in this presentation do not necessarily represent the views of the DOE, the ODNI, or the U.S. Government. This material was funded in part by the U.S. Department of Energy, Office of Science, Office of Advanced Scientific Computing Research Quantum Testbed Program.
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Presenters
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Kenneth Rudinger
- Center for Computing Research, Sandia National Laboratories
- Sandia National Laboratories
- Sandia Natl Labs