We present the "trimon", a multi-mode superconducting circuit implementing three qubits with all-to-all longitudinal coupling. This always-on interaction enables simple implementation of generalized controlled-NOT gates which form a universal set. Further, two of the three qubits are protected against Purcell decay while retaining measurability. We demonstrate high-fidelity state swapping operations between two qubits and characterize the coupling of all three qubits to a neighbouring transmon qubit. Our results offer a new paradigm for multi-qubit architecture with applications in quantum error correction, quantum simulations and quantum annealing.
Cite
@article{arxiv.1610.07915,
title = {Implementation of pairwise longitudinal coupling in a three-qubit superconducting circuit},
author = {Tanay Roy and Suman Kundu and Madhavi Chand and Sumeru Hazra and N. Nehra and R. Cosmic and A. Ranadive and Meghan P. Patankar and Kedar Damle and R. Vijay},
journal= {arXiv preprint arXiv:1610.07915},
year = {2017}
}
Comments
Main text (5 pages, 4 figures) and Supplementary Material (11 pages, 5 figures)