Protecting solid-state spins from strongly coupled environment
| Autor: | Won Kyu Calvin Sun, Mo Chen, Paola Cappellaro, Jean-Christophe Jaskula, Kasturi Saha |
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| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Strongly coupled
Physics Quantum Physics Condensed Matter - Materials Science Condensed matter physics Spins Solid-state General Physics and Astronomy Materials Science (cond-mat.mtrl-sci) FOS: Physical sciences 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences 0103 physical sciences 010306 general physics 0210 nano-technology Quantum Physics (quant-ph) |
| Popis: | Quantum memories are critical for solid-state quantum computing devices and a good quantum memory requires both long storage time and fast read/write operations. A promising system is the Nitrogen-Vacancy (NV) center in diamond, where the NV electronic spin serves as the computing qubit and a nearby nuclear spin as the memory qubit. Previous works used remote, weakly coupled $^{13}$C nuclear spins, trading read/write speed for long storage time. Here we focus instead on the intrinsic strongly coupled $^{14}$N nuclear spin. We first quantitatively understand its decoherence mechanism, identifying as its source the electronic spin that acts as a quantum fluctuator. We then propose a scheme to protect the quantum memory from the fluctuating noise by applying dynamical decoupling on the environment itself. We demonstrate a factor of $3$ enhancement of the storage time in a proof-of-principle experiment, showing the potential for a quantum memory that combines fast operation with long coherence time. 21 pages, 10 figures |
| Databáze: | OpenAIRE |
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