Improving the coherence time of a quantum system via a coupling to a short-lived system
Y Matsuzaki, X Zhu, K Kakuyanagi, H Toida… - Physical review …, 2015 - APS
Physical review letters, 2015•APS
In this Letter, we propose a counterintuitive use of a hybrid system where the coherence time
of a quantum system can be significantly improved by coupling it with a system of a shorter
coherence time. Coupling a two-level system with a single nitrogen-vacancy (NV−) center, a
dark state of the NV− center naturally forms after the hybridization. We show that this dark
state becomes robust against noise due to the coupling even when the coherence time of
the two-level system is much shorter than that of the NV− center. Our proposal opens a new …
of a quantum system can be significantly improved by coupling it with a system of a shorter
coherence time. Coupling a two-level system with a single nitrogen-vacancy (NV−) center, a
dark state of the NV− center naturally forms after the hybridization. We show that this dark
state becomes robust against noise due to the coupling even when the coherence time of
the two-level system is much shorter than that of the NV− center. Our proposal opens a new …
Abstract
In this Letter, we propose a counterintuitive use of a hybrid system where the coherence time of a quantum system can be significantly improved by coupling it with a system of a shorter coherence time. Coupling a two-level system with a single nitrogen-vacancy (NV−) center, a dark state of the NV− center naturally forms after the hybridization. We show that this dark state becomes robust against noise due to the coupling even when the coherence time of the two-level system is much shorter than that of the NV− center. Our proposal opens a new way to use a quantum hybrid system for the realization of robust quantum information processing.
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