论文标题
通过虚拟两个Qubit Gate抑制错误
Error suppression by a virtual two-qubit gate
论文作者
论文摘要
超导量子计算机的稀疏连通性导致大型掉期门开销。在这项研究中，我们将使用虚拟的两分门（VTQG）作为误差抑制技术。 VTQG仅使用单个量子门和投影测量值，可以在一对远的Qubits之间进行非本地操作。在这里，我们将VTQG应用于IBM量子计算机上横向视野模型的数字量子仿真，以抑制由于嘈杂的两Q量操作而引起的错误。我们提出了VTQG的有效使用，其中减少多个交换门会增加输出状态的保真度。获得的结果表明，由于额外的交换门，VTQG可用于抑制错误。另外，通过将脉搏有效的转卸法与VTQG结合在一起，可以观察到误差的进一步抑制。在我们的实验中，我们观察到一个数量级提高了具有8码位的横向场模型的量子模拟的准确性。
Sparse connectivity of a superconducting quantum computer results in the large experimental overheads of SWAP gates. In this study, we consider employing a virtual two-qubit gate (VTQG) as an error suppression technique. The VTQG enables a non-local operation between a pair of distant qubits using only single qubit gates and projective measurements. Here, we apply the VTQG to the digital quantum simulation of the transverse-field Ising model on an IBM quantum computer to suppress the errors due to the noisy two-qubit operations. We present an effective use of VTQG, where the reduction of multiple SWAP gates results in increasing the fidelity of the output states. The obtained results indicate that the VTQG can be useful for suppressing the errors due to the additional SWAP gates. Additionally, by combining a pulse-efficient transpilation method with the VTQG, further suppression of the errors is observed. In our experiments, we have observed one order of magnitude improvement in accuracy for the quantum simulation of the transverse-field Ising model with 8 qubits.
