Demonstration of a quantum error correction for enhanced sensitivity of photonic measurements
Lior Cohen, Y. Pilnyak, D. Istrati, Alex Retzker, H. S. Eisenberg · Physical Review A · 2016
The sensitivity of classical and quantum sensing is impaired in a noisy environment. Thus, one of the main challenges facing sensing protocols is to reduce the noise while preserving the signal. State-of-the-art quantum sensing protocols that rely on dynamical decoupling achieve this goal under the restriction of long noise correlation times. We implement a proof-of-principle experiment of a protocol to recover sensitivity by using an error correction for photonic systems that does not have this restriction. The protocol uses a protected entangled qubit to correct a single error. Our results show a recovery of about $87%$ of the sensitivity, independent of the noise probability.