TY - JOUR
T1 - Enhanced Multiqubit Phase Estimation in Noisy Environments by Local Encoding
AU - Proietti, Massimiliano
AU - Ringbauer, Martin
AU - Graffitti, Francesco
AU - Barrow, Peter
AU - Pickston, Alexander
AU - Kundys, Dmytro
AU - Cavalcanti, Daniel
AU - Aolita, Leandro
AU - Chaves, Rafael
AU - Fedrizzi, Alessandro
PY - 2019/11/1
Y1 - 2019/11/1
N2 - The first generation of multiqubit quantum technologies will consist of noisy, intermediate-scale devices for which active error correction remains out of reach. To exploit such devices, it is thus imperative to use passive error protection that meets a careful trade-off between noise protection and resource overhead. Here, we experimentally demonstrate that single-qubit encoding can significantly enhance the robustness of entanglement and coherence of four-qubit graph states against local noise with a preferred direction. In particular, we explicitly show that local encoding provides a significant practical advantage for phase estimation in noisy environments. This demonstrates the efficacy of local unitary encoding under realistic conditions, with potential applications in multiqubit quantum technologies for metrology, multipartite secrecy, and error correction.
AB - The first generation of multiqubit quantum technologies will consist of noisy, intermediate-scale devices for which active error correction remains out of reach. To exploit such devices, it is thus imperative to use passive error protection that meets a careful trade-off between noise protection and resource overhead. Here, we experimentally demonstrate that single-qubit encoding can significantly enhance the robustness of entanglement and coherence of four-qubit graph states against local noise with a preferred direction. In particular, we explicitly show that local encoding provides a significant practical advantage for phase estimation in noisy environments. This demonstrates the efficacy of local unitary encoding under realistic conditions, with potential applications in multiqubit quantum technologies for metrology, multipartite secrecy, and error correction.
UR - http://www.scopus.com/inward/record.url?scp=85074895076&partnerID=8YFLogxK
U2 - 10.1103/PhysRevLett.123.180503
DO - 10.1103/PhysRevLett.123.180503
M3 - Article
C2 - 31763876
AN - SCOPUS:85074895076
SN - 0031-9007
VL - 123
JO - Physical Review Letters
JF - Physical Review Letters
IS - 18
M1 - 180503
ER -