Quantum walks are the quantum mechanical analog of classical random walks and an extremely powerful tool in quantum simulations, quantum search algorithms, and even for universal quantum computing.
A team of researchers have designed and fabricated an 8×8 two-dimensional square superconducting qubit array composed of 62 functional qubits. They used this device to demonstrate high fidelity single and two particle quantum walks.
Furthermore, with the high programmability of this quantum processor, they implemented a Mach-Zehnder interferometer where the quantum walker coherently traverses in two paths before interfering and exiting.
By tuning the disorders on the evolution paths, the team observed interference fringes with single and double walkers.
This work is an essential milestone in the field, brings future larger scale quantum applications closer to realization on these noisy intermediate-scale quantum processors.
The paper has been published in Science.