Heralded Entanglement of On-Demand Spin-Wave Solid-State Quantum Memories for Multiplexed Quantum Network Links
Year: 2025
Type: article
Abstract: The ability to distribute heralded entanglement between distant matter nodes is a primitive for the implementation of large-scale quantum networks. Some of the most crucial requirements for future applications include high heralding rates at telecom wavelengths, multiplexed operation, and on-demand retrieval of stored excitations for synchronization of separate quantum links. Despite tremendous progress in various physical systems, the demonstration of telecom-heralded entanglement between quantum nodes featuring both multiplexed operation and on-demand retrieval remains elusive. In this work, we combine narrow band parametric photon-pair sources and solid-state quantum memories based on rare-earth doped crystals to demonstrate telecom-heralded entanglement between spatially separated spin-wave quantum memories with fully adjustable recall time and temporal multiplexing of 15 modes. In a first experiment, the storage in the spin state is conditioned on the entanglement heralding. We take advantage of the control over readout pulse phase to achieve feedforward conditional phase shifts on the stored photons depending on which heralding detector clicked. We exploit this effect to double the entanglement heralding rate for a given quantum state up to 510 counts / s , with an associated detection rate of 0.32 counts / s and measured positive concurrence by up to 6 standard deviations. In a second experiment, we simulate the communication time of a long-distance link by implementing an unconditional storage scheme with a dead time of 100 μ s . We take advantage of temporal multiplexing to increase the entanglement rates by a factor of 15 with respect to single mode storage, reaching a value of 22 counts / s per heralding detector. These results establish our architecture as a prime candidate for the implementation of scalable high-rate quantum network links.
Source: Physical Review X
DOI: 10.1103/wvv1-6lg8
Language: English
Subfield: Artificial Intelligence
Field: Computer Science
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $4,200
Funders: Gordon and Betty Moore Foundation, Fundación Cellex, “la Caixa” Foundation, Centres de Recerca de Catalunya, European Commission, Generalitat de Catalunya, Ministerio de Ciencia e Innovación, Fundación Bancaria Caixa d'Estalvis i Pensions de Barcelona, FUNDACIÓ Privada MIR-PUIG, Horizon 2020 Framework Programme, HORIZON EUROPE Framework Programme, Agència de Gestió d'Ajuts Universitaris i de Recerca, Agencia Estatal de Investigación, European Social Fund, HORIZON EUROPE Marie Sklodowska-Curie Actions, NextGenerationEU
Awards: G1175115578, G120905174, G121809054, G1255325603, Quantum Internet Alliance - Phase1, G1855990336, G1908469581, G2064799580, G2064873908, G210041235, G2262748287, G2290189609, G2309174360, G2355262757, G2601397997, G2660406951, G2668996568, G2763573136, G279363373, G280048558, G288263039, G3005324705, G300979063, G34346518, G3480869486, G3681454997, G3992582002, G4042783231, G425668148, G430777504, Integrated Quantum Repeater Nodes, G4731613563, G4742037821, G48552652, Linking Nodes for The Quantum Internet, G4944594896, G4993383890, G5080475149, G5132640529, G5195188938, G5421974903, G5424859868, G5485552701, G5845768719, G5852091828, G6042476671, G6238221415, G6482940084, Two-dimensionally multiplexed on-demand quantum memories, G6656126374, G69051668, G7084143925, G7317669515, G7607973779, G7685134749, G7731791180, G773280237, G8118709007, G8180681537, G8546142835, G8637226926, G873502337, G8764595522, G897484643, G99296377
OpenAlex ID: W4414799325