Experimental quantum computational chemistry with optimised unitary coupled cluster ansatz

Understand

Quantum computational chemistry has emerged as an important application of quantum computing.

• Hybrid quantum-classical computing methods, such as variational quantum eigensolvers (VQE), have been designed as promising solutions to quantum chemistry problems, yet challenges due to theoretical complexity and experimental imperfections hinder progress in achieving reliable and accurate results.
• Experimental works for solving electronic structures are consequently still restricted to nonscalable (hardware efficient) or classically simulable (Hartree-Fock) ansatz, or limited to a few qubits with large errors.
• The experimental realisation of scalable and high-precision quantum chemistry simulation remains elusive.