2014/12/23 by Gary Wolfowicz, Hannes Maier-Flaig, Robert Marino +5 · 4 citations
Physics and Astronomy · #Atomic and Subatomic Physics Research #Atomic physics #Coherence (philosophical gambling strategy) #Coherence time #Condensed matter physics #Photon #Physics #Quantum #Quantum and electron transport phenomena #Quantum computer #Quantum mechanics #Quantum optics and atomic interactions #Qubit #Spins #quant-ph
paper · pdf · doi:10.1103/physrevlett.114.170503
5 pages, 4 figures
arxiv created 2014/12/23 · openalex publication_date 2015/04/30 · arxiv updated 2016/07/14 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Interfacing between various elements of a computer--from memory to processors to long range communication--will be as critical for quantum computers as it is for classical computers today. Paramagnetic rare-earth doped crystals, such as Nd(3+):Y2SiO5(YSO), are excellent candidates for such a quantum interface: they are known to exhibit long optical coherence lifetimes (for communication via optical photons), possess a nuclear spin (memory), and have in addition an electron spin that can offer hybrid coupling with superconducting qubits (processing). Here we study two of these three elements, demonstrating coherent storage and retrieval between electron and (145)Nd nuclear spin states in Nd(3+):YSO. We find nuclear spin coherence times can reach 9 ms at ∼5 K, about 2 orders of magnitude longer than the electron spin coherence, while quantum state and process tomography of the storage or retrieval operation between the electron and nuclear spin reveal an average state fidelity of 0.86. The times and fidelities are expected to further improve at lower temperatures and with more homogeneous radio-frequency excitation.