Coupler-Assisted Controlled-Phase Gate with Enhanced Adiabaticity
- URL: http://arxiv.org/abs/2106.00725v1
- Date: Tue, 1 Jun 2021 18:50:17 GMT
- Title: Coupler-Assisted Controlled-Phase Gate with Enhanced Adiabaticity
- Authors: Ji Chu and Fei Yan
- Abstract summary: High-fidelity two-qubit entangling gates are essential building blocks for fault-tolerant quantum computers.
We present a theoretical study, explaining the origin of the high-contrast ZZ interaction.
We expect the scheme to potentially achieve a two-qubit gate error rate near $10-5$, which would drastically speed up the progress towards fault-tolerant quantum computation.
- Score: 1.9476527809254969
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: High-fidelity two-qubit entangling gates are essential building blocks for
fault-tolerant quantum computers. Over the past decade, tremendous efforts have
been made to develop scalable high-fidelity two-qubit gates with
superconducting quantum circuits. Recently, an easy-to-scale controlled-phase
gate scheme that utilizes the tunable-coupling architecture with
fixed-frequency qubits [Phys. Rev. Lett. 125, 240502; Phys. Rev. Lett. 125,
240503] has been demonstrated with high fidelity and attracted broad interest.
However, in-depth understanding of the underlying mechanism is still missing,
preventing us from fully exploiting its potential. Here we present a
comprehensive theoretical study, explaining the origin of the high-contrast ZZ
interaction. Based on improved understanding, we develop a general yet
convenient method for shaping an adiabatic pulse in a multilevel system, and
identify how to optimize the gate performance from design. Given
state-of-the-art coherence properties, we expect the scheme to potentially
achieve a two-qubit gate error rate near $10^{-5}$, which would drastically
speed up the progress towards fault-tolerant quantum computation.
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