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Lund reports on atomic physics

Transient Spectral Hole-Burning in Pr : Y2SiO5

Marito Olsson-Forsberg

Published Jan 1, 2003• 0 citations
OpenAlex

Abstract

This work presents the methods and results of an attempt to measure the oscillator strengths in Pr3+ : Y2Si05 .Pr3+ : Y2Si05 is a promising material in current efforts to create a quantum computer.The property which is to be exploited in the quantum computing scheme proposed by the group within which this work was done, is spinpolarization.To be able to create a polarization of the nuclear spins of the Pr3+ -ions, information about the oscillator strengths of the candidate material is crucial.This is the main object of the work in this report.

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Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE•Jun 30, 2003•0 citations
This work presents the methods and results of an attempt to measure the oscillator strengths in Pr3+ : Y2Si05 .Pr3+ : Y2Si05 is a promising material in current efforts to create a quantum computer.The property which is to be exploited in the quantum computing scheme proposed by the group within which this work was done, is spinpolarization.To be able to create a polarization of the nuclear spins of the Pr3+ -ions, information about the oscillator strengths of the candidate material is crucial.This is the main object of the work in this report.
Plane wave holography is a method of producing and detecting weak spectral holes with very low background [1]. Its success relies upon hole-burning materials of excellent optical quality with strongly absorbing zero phonon lines such as dye doped polymers which have been extensively studied [2 and references therein]. Through an extension of this technique, image storage [3] and data manipulation [4] have been demonstrated in such materials. Here, we report the application of plane wave holography to a crystalline material, Y2SiO5:Pr3+, for the first time. Spectroscopic measurements of Y2SiO5:Pr3+ have not previously been reported.
This master's thesis investigates the ground state hyperfine levels coherence time in Pr3+:Y2Si05• This property is important for the future development of quantum computers based on this or similar crystals.A suitable method to measure the coherence time at liquid helium temperature for two hyperfine levels in the 4 H3 level of Pr3+ was developed and the coherence time has also been determined approximately to 540 J.l-S.Examensarbetet undersoker koherenstiden for tva hyperfin nivaer i grundtillstandet for Pr3+:Y2Si05 .Detta ar en egenskap som ar viktig for en framtida kvantdator baserad pa denna eller liknande kristaller.En metod att mata koherenstiden vid flytande helium temperatur for tva av hyperfinnivaerna i grundtillstandet for Pr3+ har utvecklats och koherenstiden har med denna metod matts upp till 540 J.l-S.
We theoretically investigate the feasibility of using spectral hole burning in Pr3+:Y2SiO5 to prepare an ensemble of Pr3+ ions with a spectral distribution optimized for use as a quantum memory for single-photon states. We introduce figures of merit for the spectral distribution of the Pr3+ ions when used as a quantum-memory node in a Duan-Lukin-Cirac-Zoller-type quantum-repeater scheme. Finally, we describe progress toward optimizing the hole-burning sequence by using a computational model of the hole-burning process to calculate these figures of merit over a wide range of parameters.
Nanoscale systems possessing long-lived spins and the ability to coherently couple to light are highly demanded for quantum devices implementations. Several approaches, like NV centers in diamond, semiconductor quantum dots are intensively investigated in the field, where an outstanding challenge is to preserve properties, and especially optical and spin coherence lifetimes, at the nanoscale. In this context, chemically synthesized Eu3+ doped Y2O3 nanoparticles have demonstrated great potential for quantum technologies based on their narrow optical homogeneous linewidth, down to the 10 kHz level, and millisecond-long spin coherence time. Here, we investigate an alternative nanoscale material: Pr3+: Y2O3. We first determine the Pr3+ hyperfine structure in Y2O3 by spectral hole burning and then measure photon and spin echoes from nanoparticles down to 150 nm. Spin T2 up to 880 μs was obtained for the ±3/2↔±5/2 hyperfine transition at 10.42 MHz, a value which exceeds that of bulk Pr3+doped crystals so far reported. These promising results confirm nanoscale Pr3+:Y2O3 as a very appealing candidate to integrate quantum devices.
Spectral hole burning material parameters that impact optical memory architecture and performance are investigated. Optical power budget analysis for the data storage process reveals that although narrow homogeneous linewidth can confer high data density, it does not optimally support high data rates. Trading narrow linewidth for higher oscillator strength would be desirable, if attainable. Experimental measurement of oscillator strengths, quantum yield into alternative hyperfine ground state levels, and persistence of the hyperfine level populations in Eu3+:Y2SiO5 and Pr3+:Y2SiO5 are presented and discussed. Quantum yield measurements of less than 25% indicate that spin projections are strongly preserved during excitation and relaxation processes. The hole depth consequently attainable from single π-pulse illumination requires trade-offs in memory system design.