Experimental quantum coding against qubit loss error.
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.
Lu
Chao-Yang
CY
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.
Gao
Wei-Bo
WB
Zhang
Jin
J
Zhou
Xiao-Qi
XQ
Yang
Tao
T
Pan
Jian-Wei
JW
D003199:Computer Systems; D008962:Models, Theoretical; D011789:Quantum Theory