Entanglement between a Telecom Photon and an On-Demand Multimode Solid-State Quantum Memory

Rakonjac, Jelena V.; Lago-Rivera, Dario; Seri, Alessandro; Mazzera, Margherita; Grandi, Samuele; Riedmatten, Hugues de

doi:10.1103/physrevlett.127.210502

Cited by 40 publications

(31 citation statements)

References 66 publications

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“…spectral holes at multiple frequencies [22]. In Eu 3+ and Pr 3+ , this preparation method has been successfully implemented to maximize the AFC echo efficiency, while also creating high-resolution AFCs allowing for storage times in the range of 10 to 100 µs [13,14,21,22]. For the low bandwidths in these materials (< 10 MHz), this can be achieved using an acousto-optic modulator [22].…”

Section: Resultsmentioning

confidence: 99%

“…Ensemblebased quantum memories are of great interest for quantum repeaters due to their multimode (or multiplexing) capacity, which is crucial for achieving practical rates [5,6]. The main systems currently under investigation are laser-cooled alkali gases [7][8][9][10][11] and rare-earth ion doped crystals [12][13][14][15][16].…”

mentioning

confidence: 99%

“…a long optical coherence time, to maximize the number of comb lines. AFC experiments featuring long optical coherence times, in the range of 10 to 100 µs, have so far only been achieved in nuclear-spin based RE-crystals (non-Kramer ions), namely Eu 3+ :Y 2 SiO 5 [16,21,22], Pr 3+ :Y 2 SiO 5 [13,14] and Tm 3+ :Y 3 Ga 5 O 12 (YGG) [12]. However, experiments in Eu 3+ and Pr 3+ doped materials have shown AFC bandwidths of around 10 MHz or less, fundamentally limited by the nuclear hyperfine splittings of the same order, which reduces the temporal multimode capacity to the range of 10 to 100 modes [21].…”

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confidence: 99%

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Remote distribution of non-classical correlations over 1250 modes between a telecom photon and a $^{171}$Yb$^{3+}$:Y$_2$SiO$_{5}$ crystal

Businger¹,

Nicolas²,

Mejia³

et al. 2022

Preprint

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Quantum repeaters based on heralded entanglement require quantum nodes that are able to generate multimode quantum correlations between memories and telecommunication photons. The communication rate scales linearly with the number of modes, yet highly multimode quantum storage remains challenging. In this work, we demonstrate an atomic frequency comb quantum memory with a time-domain mode capacity of 1250 modes and a bandwidth of 100 MHz, to our knowledge the largest number of modes stored in the quantum regime. The memory is based on a Y2SiO5 crystal doped with 171 Yb 3+ ions, with a memory wavelength of 979 nm. The memory is interfaced with a source of non-degenerate photon pairs at 979 and 1550 nm, bandwidth-matched to the quantum memory. We obtain strong non-classical second-order cross correlations over all modes, for storage times of up to 25 µs. The telecommunication photons propagated through 5 km of fiber before the release of the memory photons, a key capability for quantum repeaters based on heralded entanglement and feed-forward operations. Building on this experiment should allow distribution of entanglement between remote quantum nodes, with enhanced rates owing to the high multimode capacity.

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Section: Resultsmentioning

confidence: 99%

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confidence: 99%

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confidence: 99%

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Remote distribution of non-classical correlations over 1250 modes between a telecom photon and a $^{171}$Yb$^{3+}$:Y$_2$SiO$_{5}$ crystal

Businger¹,

Nicolas²,

Mejia³

et al. 2022

Preprint

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“…Following the first demonstration of an AFC memory [20], several proof-of-principle demonstrations have been performed with photonic qubits and single photons, enabling light-matter [21][22][23] and matter-matter entanglement [24][25][26][27]. AFC spin-wave memories with on-demand read-out have also been demonstrated for photonic qubits [28,29] and single photons [23,30].…”

Section: Introductionmentioning

confidence: 99%

Multimode capacity of atomic-frequency comb quantum memories

Ortu

Rakonjac

Holzäpfel

et al. 2022

Quantum Sci. Technol.

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Ensemble-based quantum memories are key to developing multiplexed quantum repeaters, able to overcome the intrinsic rate limitation imposed by finite communication times over long distances. Rare-earth ion doped crystals are main candidates for highly multimode quantum memories, where time, frequency and spatial multiplexing can be exploited to store multiple modes. In this context the atomic frequency comb (AFC) quantum memory provides large temporal multimode capacity, which can readily be combined with multiplexing in frequency and space. In this article, we derive theoretical formulas for quantifying the temporal multimode capacity of AFC-based memories, for both optical memories with fixed storage time and spin-wave memories with longer storage times and on-demand read out. The temporal multimode capacity is expressed in key memory parameters, such as AFC bandwidth, fixed-delay storage time, memory efficiency, and control field Rabi frequency. Current experiments in europium- and praseodymium-doped Y$_2$SiO$_5$ are analyzed within this theoretical framework, which is also tested with newly acquired data as prospects for higher temporal capacity in these materials are considered. In addition we consider the possibility of spectral and spatial multiplexing to further increase the mode capacity, with examples given for both rare earth ions.

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“…Entanglement has already been stored and generated in these systems (11)(12)(13)(14)(15)(16), where photons are mapped into delocalized excitations of billions of ions. These quantum memories support multimode storage (17)(18)(19), and pairing them with an external entanglement source provides a link to entanglement distribution through the telecommunication networks (15,20) without the need for direct storage at telecommunication wavelengths, which is nevertheless possible in erbium-doped systems (21,22). The solid-state nature of rare earth-based memories facilitates integration in photonic devices (23)(24)(25)(26), leading to single-ion detection (27,28) and storage of entanglement in an integrated fashion (21,29).…”

Section: Introductionmentioning

confidence: 99%

Storage and analysis of light-matter entanglement in a fiber-integrated system

et al. 2022

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The deployment of a full-fledged quantum internet poses the challenge of finding adequate building blocks for entanglement distribution between remote quantum nodes. A practical system would combine propagation in optical fibers with quantum memories for light, leveraging on the existing communication network while featuring the scalability required to extend to network sizes. Here, we demonstrate a fiber-integrated quantum memory entangled with a photon at telecommunication wavelength. The storage device is based on a fiber-pigtailed laser-written waveguide in a rare earth–doped solid and allows an all-fiber stable addressing of the memory. The analysis of the entanglement is performed using fiber-based interferometers. Our results feature orders-of-magnitude advances in terms of storage time and efficiency for integrated storage of light-matter entanglement and constitute a substantial step forward toward quantum networks using integrated devices.

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Entanglement between a Telecom Photon and an On-Demand Multimode Solid-State Quantum Memory

Cited by 40 publications

References 66 publications

Remote distribution of non-classical correlations over 1250 modes between a telecom photon and a $^{171}$Yb$^{3+}$:Y$_2$SiO$_{5}$ crystal

Remote distribution of non-classical correlations over 1250 modes between a telecom photon and a $^{171}$Yb$^{3+}$:Y$_2$SiO$_{5}$ crystal

Multimode capacity of atomic-frequency comb quantum memories

Storage and analysis of light-matter entanglement in a fiber-integrated system

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