Universal Nonadiabatic Control of Small-Gap Superconducting Qubits
Daniel L. Campbell, Yun-Pil Shim, Bharath Kannan, Roni Winik, David K. Kim, Alexander Melville, Bethany M. Niedzielski, Jonilyn L. Yoder, Charles Tahan, Simon Gustavsson, William D. Oliver
DOI 10.1103/PhysRevX.10.041051 · Physical Review X
Active bibliographic source — not scientific approval
Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.
Abstract
Resonant transverse driving of a two-level system as viewed in the rotating frame couples two degenerate states at the Rabi frequency, an equivalence that emerges in quantum mechanics. While successful at controlling natural and artificial quantum systems, certain limitations may arise (e.g., the achievable gate speed) due to nonidealities like the counterrotating term. We introduce a superconducting composite qubit (CQB), formed from two capacitively coupled transmon qubits, which features a small avoided crossing—smaller than the environmental temperature—between two energy levels. We control this low-frequency CQB using solely baseband pulses, nonadiabatic transitions, and coherent Landau-Zener interference to achieve fast, high-fidelity, single-qubit operations with Clifford fidelities exceeding 99.7%. We also perform coupled qubit operations between two low-frequency CQBs. This work demonstrates that universal nonadiabatic control of low-frequency qubits is feasible using solely baseband pulses.
Similar papers
Robust, fast, and high-fidelity composite single-qubit gates for superconducting transmon qubits
similarity 0.92Hristo G. Tonchev et al.
Source status unknown — claims are unverified
Fully microwave-tunable universal gates in superconducting qubits with linear couplings and fixed transition frequencies
similarity 0.92Chad Rigetti & Michel Devoret
Source status unknown — claims are unverified
Microwave-activated two-qubit gates for fixed-coupling and fixed-frequency transmon qubits
similarity 0.91Ling Jiang et al.
Source status unknown — claims are unverified
All-Microwave Manipulation of Superconducting Qubits with a Fixed-Frequency Transmon Coupler
similarity 0.90Shotaro Shirai et al.
Source status unknown — claims are unverified
Entanglement of Two Superconducting Qubits in a Waveguide Cavity via Monochromatic Two-Photon Excitation
similarity 0.90S. Poletto et al.
Source status unknown — claims are unverified
Fast high-fidelity quantum nondemolition readout of a superconducting qubit with tunable transverse couplings
similarity 0.90Bryan T. Gard et al.
Source status unknown — claims are unverified