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arXiv 2301.05752quant-phphysics.chem-ph
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在量子计算机上对单态裂变进行建模

Modeling singlet fission on a quantum computer

Daniel Claudino, Bo Peng, Karol Kowalski, Travis S. Humble

AI总结:

研究利用Quantinuum H1-1量子计算机及量子比特缩减、测量优化和并行执行等策略,对线性H$_4$分子进行单态裂变建模,结果精确满足能量先决条件且优于经典方法。

摘要:

我们通过在量子计算机上研究线性H$_4$分子作为满足单态裂变要求的简单模型,展示了量子计算的实际应用用例。我们利用一系列独立策略来降低量子计算的总成本,即:1)逐渐减少量子比特以缩减相关Hilbert空间的尺寸;2)通过向按量子比特逐位对易(QWC)的Pauli串组共享的本征基进行旋转,实现测量优化;3)并行执行多个态制备+测量操作,将量子电路实现到Quantinuum H1-1量子硬件中所有可用的20个量子比特上。我们报告的结果满足单态裂变的能量先决条件,并且与(所选单粒子基的)精确跃迁能量高度一致,远优于被认为对单态裂变候选项在计算上可行的经典方法。

英文摘要:

We present a use case of practical utility of quantum computing by employing a quantum computer in the investigation of the linear H$_4$ molecule as a simple model to comply with the requirements of singlet fission. We leverage a series of independent strategies to bring down the overall cost of the quantum computations, namely 1) tapering off qubits in order to reduce the size of the relevant Hilbert space; 2) measurement optimization via rotations to eigenbases shared by groups of qubit-wise commuting (QWC) Pauli strings; 3) parallel execution of multiple state preparation + measurement operations, implementing quantum circuits onto all 20 qubits available in the Quantinuum H1-1 quantum hardware. We report results that satisfy the energetic prerequisites of singlet fission and which are in excellent agreement with the exact transition energies (for the chosen one-particle basis), and much superior to classical methods deemed computationally tractable for singlet fission candidates

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