Exploring Ququart Computation on a Transmon using Optimal Control
- URL: http://arxiv.org/abs/2304.11159v1
- Date: Fri, 21 Apr 2023 17:58:48 GMT
- Title: Exploring Ququart Computation on a Transmon using Optimal Control
- Authors: Lennart Maximilian Seifert, Ziqian Li, Tanay Roy, David I. Schuster,
Frederic T. Chong, Jonathan M. Baker
- Abstract summary: We demonstrate a superconducting ququart processor and implement high-fidelity ququart gates.
Our results validate ququarts as a viable tool for quantum information processing.
- Score: 3.400020514088234
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: Contemporary quantum computers encode and process quantum information in
binary qubits (d = 2). However, many architectures include higher energy levels
that are left as unused computational resources. We demonstrate a
superconducting ququart (d = 4) processor and combine quantum optimal control
with efficient gate decompositions to implement high-fidelity ququart gates. We
distinguish between viewing the ququart as a generalized four-level qubit and
an encoded pair of qubits, and characterize the resulting gates in each case.
In randomized benchmarking experiments we observe gate fidelities greater 95%
and identify coherence as the primary limiting factor. Our results validate
ququarts as a viable tool for quantum information processing.
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