Journal
SCIENCE
Volume 364, Issue 6442, Pages 753-+Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aaw1611
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Funding
- National Key Research and Development Program of China [2017YFA0304300, 2016YFA0302104, 2016YFA0301200, 2017YFA0303703]
- Chinese Academy of Science and its Strategic Priority Research Program [XDB28000000]
- Science and Technology Committee of Shanghai Municipality
- NSFC [11574380, 11774022, 11774406, 11874212, U1530401, 11890704, U1801661]
- AFOSR [FA9550-14-1-0040]
- AOARD [FA2386-18-1-4045]
- ARO [W911NF-18-1-0358]
- JSPS
- JST (CREST) [JPMJCR1676]
- Anhui Initiative in Quantum Information Technologies
- JST (Q-LEAP)
- Alibaba Cloud
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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 quantum walks on a quantum processor, using superconducting qubits as artificial atoms and tomographic readout, paves the way to quantum simulation of many-body phenomena and universal quantum computation.
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