Long-lived quantum memories with rare-earth ions doped in crystals

Abstract

Quantum memory is a core enabling device for large-scale quantum networks, serving as the fundamental building block for quantum repeaters and transportable quantum memories. Among various physical platforms, rare-earth-ion-doped crystals stand out as one of the most promising solid-state candidates for long-lived photonic quantum memories, owing to their exceptionally long spin coherence time and their compatibility with integration. In this review, we first introduce the physical mechanisms underlying long-lived spin coherence in rare-earth systems, with particular emphasis on the zero-first-order-Zeeman transition and dynamical decoupling techniques. We then review the experimental progress in this field, highlighting three distinct lifetimes--the spin coherence time, the light storage time, and the quantum storage time--and covering experiments that have achieved hour-scale spin coherence, minute- to hour-scale light storage, and minute-scale single-photon-level quantum storage. Finally, we discuss the remaining challenges that hinder the realization of practical long-lived quantum memories, explore potential strategies to overcome these obstacles, and outline the prospects for their future applications in quantum networks.

arXiv commentThe incorrect value 4.14 on page 7 of the published version has been corrected to 1.16

References in corpus (52)

• Quantum Teleportation is a Universal Computational Primitive
• Dark-State Polaritons in Electromagnetically Induced Transparency
• Secure quantum key distribution with realistic devices
• Secure quantum key distribution over 421 km of optical fiber
• Keeping a Quantum Bit Alive by Optimized $\pi$-Pulse Sequences
• Multimode quantum memory based on atomic frequency combs
• Broadband waveguide quantum memory for entangled photons
• A solid state light-matter interface at the single photon level
• Efficient long distance quantum communication
• Longer-Baseline Telescopes Using Quantum Repeaters
• A Single-Atom Quantum Memory
• Sending-or-Not-Sending with Independent Lasers: Secure Twin-Field Quantum Key Distribution Over 509 km
• Functional Quantum Nodes for Entanglement Distribution over Scalable Quantum Networks
• Telecom-heralded entanglement between remote multimode solid-state quantum memories
• Robust dynamical decoupling for quantum computing and quantum memory
• Entangling single atoms over 33 km telecom fibre
• Heralded entanglement distribution between two absorptive quantum memories
• Dynamic decoherence control of a solid-state nuclear quadrupole qubit
• One-hour coherent optical storage in an atomic frequency comb memory
• Impedance-matched cavity quantum memory
• Efficient quantum memory using a weakly absorbing sample
• Distributed Quantum Computing across an Optical Network Link
• Coherent spin control at the quantum level in an ensemble-based optical memory
• Quantum Storage of Frequency-Multiplexed Heralded Single Photons
• Arbitrarily Accurate Pulse Sequences for Robust Dynamical Decoupling
• Storage of photonic time-bin qubits for up to 20 ms in a rare-earth doped crystal
• Nuclear spin-wave quantum register for a solid state qubit
• Factoring 2048-bit RSA Integers in 177 Days with 13436 Qubits and a Multimode Memory
• Quantum computing with an inhomogeneously broadened ensemble of ions: Suppression of errors from detuning variations by specially adapted pulses and coherent population trapping
• Decoherence-protected memory for a single-photon qubit
• Why the two-pulse photon echo is not a good quantum memory protocol
• The Deep Space Quantum Link: Prospective Fundamental Physics Experiments using Long-Baseline Quantum Optics
• Elimination of Noise in Optically Rephased Photon Echoes
• Cavity-Enhanced Atom-Photon Entanglement with Subsecond Lifetime
• Nonlocal photonic quantum gates over 7.0 km
• Coherent control of a nuclear spin via interactions with a rare-earth ion in the solid-state
• Quantum memories and the double-slit experiment: implications for astronomical interferometry
• Quantum memories for fundamental science in space
• Asynchronous Quantum Repeater using Multiple Quantum Memory
• A millisecond integrated quantum memory for photonic qubits
• Coherent Optical Memory Baesd on A Laser-written On-chip Waveguide
• Characterization of the hyperfine interaction of the excited ${}^5$D${}_0$ state of Eu${}^{3+}$:Y${}_2$SiO${}_5$
• A Raman-Heterodyne Study of the Hyperfine Interaction of the Optically-Excited State ${}^5$D${}_0$ of Eu${}^{3+}$:Y${}_2$SiO${}_5$
• Uniting Quantum Processing Nodes of Cavity-coupled Ions with Rare-earth Quantum Repeaters Using Single-photon Pulse Shaping Based on Atomic Frequency Comb
• Efficient integrated quantum memory for light
• Satellite-assisted quantum communication with single photon sources and atomic memories
• Entanglement Assisted Non-local Optical Interferometry in a Quantum Network
• A Metropolitan-scale Multiplexed Quantum Repeater with Bell Nonlocality
• Global-scale quantum networking using hybrid-channel quantum repeaters with relays based on a chain of balloons
• Random access and high dimensional integrated quantum memory
• Minute-Scale Photonic Quantum Memory
• Quantum Storage of Qubits in an Array of Independently Controllable Solid-State Quantum Memories