Southwest Quantum Information and Technology

Improved fidelity of quantum subroutines using parametrized entangling gates

Presenting Author: Karl Mayer, Quantinuum
Contributing Author(s): Charlie Baldwin, Nathaniel Burdick, Jonathan Sedlacek

Continuously parametrized entangling gates allow for reduced gate counts in a variety of quantum circuits. We implement a native Pauli ZZ interaction with arbitrary rotation angle in a trapped ion quantum computer with a QCCD architecture. Using cycle benchmarking, we obtain partial estimates of the stochastic Pauli error channel associated with the gate as a function of rotation angle. We then compile two quantum subroutines, namely the quantum Fourier transform (QFT) and the multi-qubit controlled-Z gate, into circuits with and without the use of parametrized two-qubit gates. We run these circuits with up to 12 qubits and estimate lower bounds on the process fidelity of the circuits in each case. We compare the results with simulations using the error models obtained from cycle benchmarking.

(Session 5 : Thursday from 5:00 pm - 7:00 pm)