18-qubit entanglement with photon's three degrees of freedom
| Autor: | Chao-Yang Lu, Nai-Le Liu, Chao Chen, Wei Li, Yu-Qiang Fang, Zu-En Su, He-Liang Huang, Chang Liu, Jian-Wei Pan, Xiao Jiang, Jun Zhang, Ming-Cheng Chen, Xi-Lin Wang, Li Li, Yi-Han Luo |
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| Rok vydání: | 2018 |
| Předmět: |
Physics
Quantum Physics Angular momentum Photon General Physics and Astronomy FOS: Physical sciences 02 engineering and technology Quantum entanglement 021001 nanoscience & nanotechnology Polarization (waves) 01 natural sciences Quantum logic Three degrees of freedom Qubit Quantum mechanics 0103 physical sciences Astronomical interferometer 010306 general physics 0210 nano-technology Quantum Physics (quant-ph) |
| DOI: | 10.48550/arxiv.1801.04043 |
| Popis: | A central theme in quantum information science is to coherently control an increasing number of quantum particles as well as their internal and external degrees of freedom (DoFs), meanwhile maintaining a high level of coherence. The ability to create and verify multiparticle entanglement with individual control and measurement of each qubit serves as an important benchmark for quantum technologies. To this end, genuine multipartite entanglement have been reported up to 14 trapped ions, 10 photons, and 10 superconducting qubits. Here, we experimentally demonstrate an 18-qubit Greenberger-Horne-Zeilinger (GHZ) entanglement by simultaneous exploiting three different DoFs of six photons, including their paths, polarization, and orbital angular momentum (OAM). We develop high-stability interferometers for reversible quantum logic operations between the photon's different DoFs with precision and efficiencies close to unity, enabling simultaneous readout of 262,144 outcome combinations of the 18-qubit state. A state fidelity of 0.708(16) is measured, confirming the genuine entanglement of all the 18 qubits. Comment: submitted |
| Databáze: | OpenAIRE |
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