Focusing on the five-qubit quantum error correcting code, the so-called 'perfect code' that corrects single generic qubit errors, they theoretically compiled and optimized its encoding process to have the minimal possible number (eight) of nearest-neighbor controlled-phase gates. This is achieved first by dedicated experimental optimization of superconducting quantum qubits, enabling the realization of more than a hundred quantum gates. These scientists completed the important step towards the implementation of quantum error correction.
#EXPERIMENTAL QUANTUM ERROR CORRECTION CODE#
The authors realized the ] code on a superconducting quantum processor, verified the viability of experimental realization of quantum error correcting codes with superconducting qubits. In a new research article published in the Beijing-based National Science Review, scientists at the University of Science and Technology of China, the Tsinghua University, and at the University of Oxford, present their latest work on experimental exploration of five-qubit quantum error correcting code with superconducting qubits.
![experimental quantum error correction experimental quantum error correction](https://quantum-journal.org/wp-content/uploads/2020/12/2009.13140v2-1024x512.png)
It remains one of the greatest and also notoriously difficult challenges to realize a universal quantum error correcting code for more than a decade. Although tremendous efforts have been devoted to demonstrate quantum error correcting codes with different quantum hardware, previous realizations are limited to be against certain types of errors or to prepare special logical states. An essential milestone is the achievement of error-corrected logical qubits that genuinely benefit from error correction, outperforming simple physical qubits. Universal fault-tolerant quantum computing relies on the implementation of quantum error correction.
![experimental quantum error correction experimental quantum error correction](https://scitechdaily.com/images/A-New-Quantum-Error-Correcting-Code-373x210.jpg)
(c) Expectation values of logical Pauli operators and state fidelity of the encoded magic state. (b) Expectation values of 31 stabilizers for the encoded logical state |T>_L. Image: (a) Encoding quantum circuit of the five-qubit code.