2018/01/31 by Mo Chen, Won Kyu Calvin Sun, Kasturi Saha +2
Materials Science · Physics and Astronomy · #Diamond and Carbon-based Materials Research #Magnetic properties of thin films #Noise (video) #Quantum #Quantum computer #Quantum decoherence #Quantum error correction #Quantum memory #Quantum optics and atomic interactions #Qubit #Spin (aerodynamics) #Spins #cond-mat.mtrl-sci #quant-ph
paper · pdf · doi:10.1088/1367-2630/aac542
published as New J. Phys. 20 (2018) 063011 · 21 pages, 10 figures
openalex created_date 2018/01/12 · arxiv created 2018/04/11 · openalex publication_date 2018/05/16 · arxiv updated 2018/06/26 · openalex updated_date 2026/08/06
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.