Dynamical Decoupling of Spin Ensembles with Strong Anisotropic Interactions

Merkel, Benjamin; Fariña, Pablo Cova; Reiserer, Andreas

doi:10.1103/physrevlett.127.030501

Cited by 21 publications

(19 citation statements)

References 67 publications

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“…An exponential fit leads to an optical coherence of 0.14(1) ms and 0.54(1) ms, respectively. Compared to recent measurements with bulk crystals [19], we observe a tenfold improvement that is explained by the reduction of dopant interactions [18,21] at our lower concentration.…”

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confidence: 80%

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Coherent and Purcell-enhanced emission from erbium dopants in a cryogenic high-Q resonator

Merkel,

Ulanowski,

Reiserer

2020

Preprint

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The stability and outstanding coherence of dopants and other atom-like defects in tailored host crystals make them a leading platform for the implementation of distributed quantum information processing and sensing in quantum networks. Albeit the required efficient light-matter coupling can be achieved via the integration into nanoscale resonators, in this approach the proximity of interfaces is detrimental to the coherence of even the least-sensitive emitters. Here, we establish an alternative: By integrating a 19 µm thin erbium-doped crystal into a cryogenic Fabry-Perot resonator with a quality factor of 9 • 10 6 , we can demonstrate 59(6)-fold enhancement of the emission rate, corresponding to a two-level Purcell factor of 530(50), while preserving lifetime-limited optical coherence up to 0.54(1) ms. With its emission at the minimal-loss wavelength of optical fibers and its outcoupling efficiency of 46(8) %, our system enables coherent and efficient nodes for long-distance quantum networks.

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confidence: 80%

“…Our system thus enables efficient, cavity-enhanced quantum memories [23], in which ultra-low dopant concentration overcomes the limitations imposed by spin interactions [21]. In addition, the possibly good mode overlap with superconducting resonators facilitates efficient microwave-to-optical conversion [24,25].…”

mentioning

confidence: 91%

Coherent and Purcell-enhanced emission from erbium dopants in a cryogenic high-Q resonator

Merkel,

Ulanowski,

Reiserer

2020

Preprint

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“…detailed studies of the spin coherence and its improvement by dynamical decoupling [31]. Furthermore, our measurements pave the way to use Er:YSO as a novel platform for quantum sensing.…”

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confidence: 74%

“…Previous setups with erbium [12,29] and NV center ensembles [30] used high-Q resonators. This has the advantage of requiring little drive power, but inevitably comes at the price of a small bandwidth -too small to achieve coherent control of the ensemble on the sub-µs timescale of the spin bath evolution in YSO crystals with Kramers dopants [27,31].…”

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confidence: 99%

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Coherent Control in the Ground and Optically Excited States of an Ensemble of Erbium Dopants

et al. 2021

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Ensembles of erbium dopants can realize quantum memories and frequency converters that operate in the minimal-loss wavelength band of fiber optical communication. Their operation requires the initialization, coherent control and readout of the electronic spin state. In this work, we use a split-ring microwave resonator to demonstrate such control in both the ground and optically excited state. The presented techniques can also be applied to other combinations of dopant and host, and may facilitate the development of new quantum memory protocols and sensing schemes.

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Spectral Multiplexing of Rare‐Earth Emitters in a Co‐Doped Crystalline Membrane

Ulanowski,

Früh,

Salamon

et al. 2024

Advanced Optical Materials

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The spectral addressing of many individual rare‐earth dopants in optical resonators offers great potential for realizing distributed quantum information processors. To this end, it is required to understand and control the spectral properties of the emitters in micron‐scale devices. Here, erbium emitters are investigated in a Fabry–Perot resonator that contains a 10 µm thin membrane of crystalline yttrium orthosilicate that is co‐doped with europium. The co‐doping allows for tailoring the inhomogeneous distribution of the emitter frequency. With this approach, more than 360 spectrally resolved emitters are observed with Purcell factors exceeding 35, each of which constitutes an individually addressable qubit within the micron‐scale resonator. In addition to this spectral multiplexing, the optical coherence is preserved up to 0.62(3) ms under dynamical decoupling. Without decoupling, the coherence still reaches the lifetime limit for the emitters with the strongest Purcell enhancement that leads up to a 110‐fold lifetime reduction, down to 0.104(9) ms. Future work may combine this with long‐lived nuclear spin memories, which makes the investigated co‐doped membranes a promising platform for quantum repeaters and distributed quantum computers.

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Dynamical Decoupling of Spin Ensembles with Strong Anisotropic Interactions

Cited by 21 publications

References 67 publications

Coherent and Purcell-enhanced emission from erbium dopants in a cryogenic high-Q resonator

Coherent and Purcell-enhanced emission from erbium dopants in a cryogenic high-Q resonator

Coherent Control in the Ground and Optically Excited States of an Ensemble of Erbium Dopants

Spectral Multiplexing of Rare‐Earth Emitters in a Co‐Doped Crystalline Membrane

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