Integration of optically active Neodymium ions in Niobium devices (Nd:Nb): Quantum memory for hybrid quantum entangled systems

O. M. Nayfeh*, D. Chao, N. Djapic, P. Sims, B. Liu, S. Sharma, L. Lerum, M. Fahem, V. Dinh, S. Zlatanovic, B. Lynn, C. Torres, B. Higa, J. Moore, A. Upchurch, J. Cothern, M. Tukeman, R. Barua, B. Davidson, A. D. RamirezC. D. Rees, V. Anant, G. S. Kanter

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution


Optically active rare-earth Neodymium (Nd) ions are integrated in Niobium (Nb) thin films forming a new quantum memory device (Nd:Nb) targeting long-lived coherence times and multi-functionality enabled by both spin and photon storage properties. Nb is implanted with Nd spanning 10-60 keV energy and 1013-1014 cm-2 dose producing a 1-3% Nd:Nb concentration as confirmed by energy-dispersive X-ray spectroscopy. Scanning confocal photoluminescence (PL) at 785 nm excitation are made and sharp emission peaks from the 4F3/2-< 4I11/2 Nd3+ transition at 1064-1070 nm are examined. In contrast, un-implanted Nb is void of any peaks. Line-shapes at room temperature are fit with Lorentzian profiles with line-widths of 4-5 nm and 1.3 THz bandwidth and the impacts of hyperfine splitting via the metallic crystal potential are apparent and the co-contribution of implant induced defects. With increasing Nd from 1% to 3%, there is a 0.3 nm red shift and increased broadening to a 4.8 nm linewidth. Nd:Nb is photoconductive and responds strongly to applied fields. Furthermore, optically detected magnetic resonance (ODMR) measurements are presented spanning near-infrared telecom band. The modulation of the emission intensity with magnetic field and microwave power by integration of these magnetic Kramer type Nd ions is quantified along with spin echoes under pulsed microwave π-π/2 excitation. A hybrid system architecture is proposed using spin and photon quantum information storage with the nuclear and electron states of the Nd3+ and neighboring Nb atoms that can couple qubit states to hyperfine 7/2 spin states of Nd:Nb and onto NIR optical levels excitable with entangled single photons, thus enabling implementation of computing and networking/internet protocols in a single platform.

Original languageEnglish (US)
Title of host publicationQuantum Photonic Devices
EditorsMario Agio, Cesare Soci, Kartik Srinivasan
ISBN (Electronic)9781510611733
StatePublished - 2017
EventQuantum Photonic Devices 2017 - San Diego, United States
Duration: Aug 6 2017Aug 7 2017

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


OtherQuantum Photonic Devices 2017
CountryUnited States
CitySan Diego


  • Neodymium
  • Niobium
  • Quantum memory
  • Rare-earth ions
  • quantum internet
  • quantum systems

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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