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Efficient Quantum Error Correction of Dephasing Induced by a Common Fluctuator.
- Source :
-
Physical Review Letters . 1/17/2020, Vol. 124 Issue 2, p1-1. 1p. - Publication Year :
- 2020
-
Abstract
- Quantum error correction is expected to be essential in large-scale quantum technologies. However, the substantial overhead of qubits it requires is thought to greatly limit its utility in smaller, near-term devices. Here we introduce a new family of special-purpose quantum error-correcting codes that offer an exponential reduction in overhead compared to the usual repetition code. They are tailored for a common and important source of decoherence in current experiments, whereby a register of qubits is subject to phase noise through coupling to a common fluctuator, such as a resonator or a spin defect. The smallest instance encodes one logical qubit into two physical qubits, and corrects decoherence to leading-order using a constant number of one- and two-qubit operations. More generally, while the repetition code on n qubits corrects errors to order tO(n), with t the time between recoveries, our codes correct to order tO(2n). Moreover, they are robust to model imperfections in small- and intermediate-scale devices, where they already provide substantial gains in error suppression. As a result, these hardware-efficient codes open a potential avenue for useful quantum error correction in near-term, pre-fault tolerant devices. [ABSTRACT FROM AUTHOR]
- Subjects :
- *ERROR-correcting codes
*ERROR correction (Information theory)
*PHASE noise
*QUBITS
Subjects
Details
- Language :
- English
- ISSN :
- 00319007
- Volume :
- 124
- Issue :
- 2
- Database :
- Academic Search Index
- Journal :
- Physical Review Letters
- Publication Type :
- Academic Journal
- Accession number :
- 141407472
- Full Text :
- https://doi.org/10.1103/PhysRevLett.124.020504