Designing High-Fidelity Single-Shot Three-Qubit Gates: A Machine-Learning Approach
Ehsan Zahedinejad, Joydip Ghosh, Barry C. Sanders · Physical Review Applied · 2016
To build a quantum computer, one can simplify the design of multi-qubit elements (logic gates) by treating them as series of well known one- and two-qubit gates---at the price of a slower processor. What if there were a handy means for $d\phantom{\rule{0}{0ex}}i\phantom{\rule{0}{0ex}}r\phantom{\rule{0}{0ex}}e\phantom{\rule{0}{0ex}}c\phantom{\rule{0}{0ex}}t$ multi-qubit design? The authors show numerically that, under existing experimental constraints, their recently developed SuSSADE scheme can yield three-qubit gates for single-shot entangling operations with fidelity greater than 99.9%. This powerful approach brings us that much closer to a fault-tolerant solid-state quantum computer.