Quantum repeaters with individual rare-earth ions at telecommunication wavelengths

Asadi, Faezeh Kimiaee; Lauk, Nikolai; Wein, Stephen C.; Sinclair, Neil; O’Brien, Christopher; Simon, Christoph

doi:10.22331/q-2018-09-13-93

Cited by 33 publications

(29 citation statements)

References 81 publications

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“…They have been used extensively as ensemble-based quantum memories 25 – 29 . REI possess permanent dipole moments with different values in the ground and excited states, which enables strong dipolar interactions between nearby ions, opening the door to the realization of quantum gates between two or more matter qubits, using a dipole-blockade mechanism achieved by exciting one ion 9 , e.g., between erbium and another ion species in the context of quantum repeaters 30 .…”

Section: Introductionmentioning

confidence: 99%

Dynamic control of Purcell enhanced emission of erbium ions in nanoparticles

et al. 2021

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The interaction of single quantum emitters with an optical cavity enables the realization of efficient spin-photon interfaces, an essential resource for quantum networks. The dynamical control of the spontaneous emission rate of quantum emitters in cavities has important implications in quantum technologies, e.g., for shaping the emitted photons’ waveform or for driving coherently the optical transition while preventing photon emission. Here we demonstrate the dynamical control of the Purcell enhanced emission of a small ensemble of erbium ions doped into a nanoparticle. By embedding the nanoparticles into a fully tunable high finesse fiber based optical microcavity, we demonstrate a median Purcell factor of 15 for the ensemble of ions. We also show that we can dynamically control the Purcell enhanced emission by tuning the cavity on and out of resonance, by controlling its length with sub-nanometer precision on a time scale more than two orders of magnitude faster than the natural lifetime of the erbium ions. This capability opens prospects for the realization of efficient nanoscale quantum interfaces between solid-state spins and single telecom photons with controllable waveform, for non-destructive detection of photonic qubits, and for the realization of quantum gates between rare-earth ion qubits coupled to an optical cavity.

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Section: Introductionmentioning

confidence: 99%

Dynamic control of Purcell enhanced emission of erbium ions in nanoparticles

et al. 2021

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“…(The degree of a node is defined to be the number of edges connected to that node.) Several different platforms have been considered for quantum memories in quantum repeater networks, such as trapped ions [46], Rydberg atoms [47,48], atom-cavity systems [49,50], NV centers in diamond [43,[51][52][53][54][55], individual rare-earth ions in crystals [56], and superconducting processors [57].…”

Section: Network Architectures and Entanglement Distribution Protocolsmentioning

confidence: 99%

Practical figures of merit and thresholds for entanglement distribution in quantum networks

Khatri

Matyas

Siddiqui

et al. 2019

Phys. Rev. Research

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Before global-scale quantum networks become operational, it is important to consider how to evaluate their performance so that they can be suitably built to achieve the desired performance. In this work, we consider three figures of merit for the performance of a quantum network: the average global connection time, the average point-to-point connection time, and the average largest entanglement cluster size. These three quantities are based on the generation of elementary links in a quantum network, which is a crucial initial requirement that must be met before any long-range entanglement distribution can be achieved. We evaluate these figures of merit for a particular class of quantum repeater protocols consisting of repeat-until-success elementary link generation along with entanglement swapping at intermediate nodes in order to achieve long-range entanglement. We obtain lower and upper bounds on these three quantities, which lead to requirements on quantum memory coherence times and other aspects of quantum network implementations. Our bounds are based solely on the inherently probabilistic nature of elementary link generation in quantum networks, and they apply to networks with arbitrary topology. CONTENTS

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“…A variety of platforms have been proposed for the construction of a quantum repeater, including atomic-ensembles [14], individual rare-earth ions [15,16], nitrogen-vacancy centers in diamond [17], and semiconductor quantum dots [18].…”

Section: Introductionmentioning

confidence: 99%

Quantum repeaters based on individual electron spins and nuclear-spin-ensemble memories in quantum dots

Sharman

Asadi

Wein

et al. 2021

Quantum

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Inspired by recent developments in the control and manipulation of quantum dot nuclear spins, which allow for the transfer of an electron spin state to the surrounding nuclear-spin ensemble for storage, we propose a quantum repeater scheme that combines individual quantum dot electron spins and nuclear-spin ensembles, which serve as spin-photon interfaces and quantum memories respectively. We consider the use of low-strain quantum dots embedded in high-cooperativity optical microcavities. Quantum dot nuclear-spin ensembles allow for the long-term storage of entangled states, and heralded entanglement swapping is performed using cavity-assisted gates. We highlight the advances in quantum dot technologies required to realize our quantum repeater scheme which promises the establishment of high-fidelity entanglement over long distances with a distribution rate exceeding that of the direct transmission of photons.

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Quantum repeaters with individual rare-earth ions at telecommunication wavelengths

Cited by 33 publications

References 81 publications

Dynamic control of Purcell enhanced emission of erbium ions in nanoparticles

Dynamic control of Purcell enhanced emission of erbium ions in nanoparticles

Practical figures of merit and thresholds for entanglement distribution in quantum networks

Quantum repeaters based on individual electron spins and nuclear-spin-ensemble memories in quantum dots

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