Quantum Computing on near term devices

Keisuke Fujii

Ben Geoffrey A S

Fault-tolerant quantum computers may be far off, however solving real world quantum chemistry problems on near-term quantum devices is possible through the Pennylane which provides interface to use any of the quantum hardware provided by any of the quantum hardware providers such as IBM, Google or Microsoft. A demonstrated use of Pennylane to solve real world quantum chemical problems on near-term quantum devices is shown. Ab initio quantum chemical calculations of dissociation energy of water molecule on the near-term quantum hardware using the Pennylane interface yielded a dissociation energy comparable to experiment and therefore it is recommended that the quantum chemistry community use near-term quantum devices to leverage quantum computing advantage to solve quantum chemical problems.

Ben Geoffrey A S

Fault-tolerant quantum computers may be far off, however solving real world quantum chemistry problems on near-term quantum devices is possible through the Pennylane which provides interface to use any of the quantum hardware provided by any of the quantum hardware providers such as IBM, Google or Microsoft. A demonstrated use of Pennylane to solve real world quantum chemical problems on near-term quantum devices is shown. Ab initio quantum chemical calculations of dissociation energy of water molecule on the near-term quantum hardware using the Pennylane interface yielded a dissociation energy comparable to experiment and therefore it is recommended that the quantum chemistry community use near-term quantum devices to leverage quantum computing advantage to solve quantum chemical problems.

Andreas H. Trabesinger

Erik P. DeBenedictis

Yun-Hua Kuo, Hongbin Chen

The idea of simulating quantum physics with controllable quantum devices had been proposed several decades ago. With the extensive development of quantum technology, large-scale simulation, such as the analog quantum simulation tailoring an artificial Hamiltonian mimicking the system of interest, has been implemented on elaborate quantum experimental platforms. However, due to the limitations caused by the significant noises and the connectivity, analog simulation is generically infeasible on near-term quantum computing platforms. Here we propose an alternative analog simulation approach on near-term quantum devices. Our approach circumvents the limitations by adaptively partitioning the bath into several groups based on the performance of the quantum devices. We apply our approach to simulate the free induction decay of the electron spin in a diamond $\mathrm{N}{\mathrm{V}}^{\ensuremath{-}}$ center coupled to a huge number of nuclei and investigate the nonclassicality induced by the nuclear spin polarization. The simulation is implemented collaboratively with authentic devices and simulators on IBM quantum computers. We have also applied our approach to address the nonclassical noise caused by the crosstalk between qubits. This work sheds light on a flexible approach to simulate large-scale materials on noisy near-term quantum computers.