Title: Pulse Design of Baseband Flux Control for Adiabatic Controlled-Phase Gates in Superconducting Circuits Show Chinese title

Title: 超导电路绝热受控相门基带通量控制的脉冲设计

Abstract: Despite progress towards achieving low error rates with superconducting qubits, error-prone two-qubit gates remain a bottleneck for realizing large-scale quantum computers. Therefore, a systematic framework to design high-fidelity gates becomes imperative. One type of two-qubit gate in superconducting qubits is the controlled-phase (CPHASE) gate, which utilizes a conditional interaction between higher energy levels of the qubits controlled by a baseband flux pulse on one of the qubits or a tunable coupler. In this work, we study an adiabatic implementation of CPHASE gates and formulate the design of the control trajectory for the gate as a pulse-design problem. We show in simulation that the Chebyshev-based trajectory can, in certain cases, enable gates with gate infidelity lower by an average of 23.3% when compared to the widely used Slepian-based trajectory. Show Chinese abstract

Abstract: 尽管在实现超导量子比特的低错误率方面取得了进展，但容易出错的两量子比特门仍然是构建大规模量子计算机的瓶颈。因此，设计高保真度门的系统框架变得至关重要。超导量子比特中的一种两量子比特门是受控-相位（CPHASE）门，它利用由一个量子比特上的基带通量脉冲或可调耦合器控制的量子比特高能级之间的条件相互作用。在这项工作中，我们研究了CPHASE门的绝热实现，并将门的控制轨迹设计表述为脉冲设计问题。通过模拟，我们展示了基于切比雪夫轨迹在某些情况下可以使得门的保真度平均提高23.3%，相比于广泛使用的基于斯莱皮安轨迹。