Journal Article

Strongly correlated quantum walks with a 12-qubit superconducting processor

Gong, Ming, Zheng, Yarui, Xu, Yu, Xia, Keyu, Nori, Franco, Yan, Zhiguang, Wang, Can, Peng, Cheng-Zhi, Pan, Jian-Wei, Fan, Heng, Guo, Cheng, Li, Shaowei, Lin, Jin, Sun, Lihua, Zhang, Yu-Ran, Liang, Futian, You, J. Q., Wu, Yulin, Rong, Hao, Zhu, Xiaobo, Deng, Hui

2019

Overview

Quantum walks are the quantum analogs of classical random walks, which allow for the simulation of large-scale quantum many-body systems and the realization of universal quantum computation without time-dependent control.We experimentally demonstrate quantum walks of one and two strongly correlated microwave photons in a one-dimensional array of 12 superconducting qubits with short-range interactions. First, in one-photon quantum walks, we observed the propagation of the density and correlation of the quasiparticle excitation of the superconducting qubit and quantum entanglement between qubit pairs. Second, when implementing two-photon quantum walks by exciting two superconducting qubits,we observed the fermionization of strongly interacting photons from the measured time-dependent long-range anticorrelations, representing the antibunching of photons with attractive interactions. The demonstration of quantumwalks on a quantumprocessor, using superconducting qubits as artificial atoms and tomographic readout, paves the way to quantum simulation of many-body phenomena and universal quantum computation.

• Publisher: American Association for the Advancement of Science,The American Association for the Advancement of Science
• Subject: Algorithms / Complex systems / Computation / Computer simulation / Correlation / Microprocessors / Photons / Quantum dots / Quantum entanglement / Quantum mechanics / Qubits (quantum computing) / Random walk / Random walk theory / Rangefinding / Simulation / Superconductivity / Time dependence