Year: 2018
Type: article
Abstract: Quantum metrology has many important applications in science and technology, ranging from frequency spectroscopy to gravitational wave detection. Quantum mechanics imposes a fundamental limit on measurement precision, called the Heisenberg limit, which can be achieved for noiseless quantum systems, but is not achievable in general for systems subject to noise. Here we study how measurement precision can be enhanced through quantum error correction, a general method for protecting a quantum system from the damaging effects of noise. We find a necessary and sufficient condition for achieving the Heisenberg limit using quantum probes subject to Markovian noise, assuming that noiseless ancilla systems are available, and that fast, accurate quantum processing can be performed. When the sufficient condition is satisfied, a quantum error-correcting code can be constructed that suppresses the noise without obscuring the signal; the optimal code, achieving the best possible precision, can be found by solving a semidefinite program.
Source: Nature Communications
Authors: Sisi Zhou, Mengzhen Zhang, John Preskill, Liang Jiang
Institutions: Yale University, California Institute of Technology
Language: English
Subfield: Artificial Intelligence
Field: Computer Science
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $6,990
Awards: G1523888516, G160464177, G165179637, G1657338961, G2598085392, G300535340, G3392305090, G3424441068, G3663418429, G4645358078, G4746202754, G4835671942, G5248880499, G5307381730, G5488723185, G6141599669, G657448715, G6858165667, G7142813775, G7452299184, G7791176890, G7900882, G8257659198, EFRI ACQUIRE: Integrated Nanophotonic Solid State Memories for Telecom Wavelength Quantum Repeaters
OpenAlex ID: W2622552587