Experimental quantum coding against qubit loss error |
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Authors: | Lu Chao-Yang Gao Wei-Bo Zhang Jin Zhou Xiao-Qi Yang Tao Pan Jian-Wei |
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Affiliation: | Hefei National Laboratory for Physical Sciences at Microscale and Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China. |
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Abstract: | The fundamental unit for quantum computing is the qubit, an isolated, controllable two-level system. However, for many proposed quantum computer architectures, especially photonic systems, the qubits can be lost or can leak out of the desired two-level systems, posing a significant obstacle for practical quantum computation. Here, we experimentally demonstrate, both in the quantum circuit model and in the one-way quantum computer model, the smallest nontrivial quantum codes to tackle this problem. In the experiment, we encode single-qubit input states into highly entangled multiparticle code words, and we test their ability to protect encoded quantum information from detected 1-qubit loss error. Our results prove in-principle the feasibility of overcoming the qubit loss error by quantum codes. |
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Keywords: | quantum information quantum computation quantum error correction loss-tolerant quantum code multi-photon entaglement |
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