Quantum storage of entangled photons at telecom wavelengths in a crystal

Abstract

The quantum internet -- in synergy with the internet that we use today -- promises an enabling platform for next-generation information processing, including exponentially speed-up distributed computation, secure communication, and high-precision metrology. The key ingredients for realizing such a global network are the distribution and storage of quantum entanglement. As ground-based quantum networks are likely to be based on existing fiber networks, telecom-wavelength entangled photons and corresponding quantum memories are of central interest. Recently, ${}^{167}\mathrm{E}{\mathrm{r}}^{3+}$ ions have been identified as a promising candidate for an efficient, broadband quantum memory at telecom wavelength. However, to date, no storage of entangled photons, the crucial step of quantum memory using these promising ions, ${}^{167}\mathrm{E}{\mathrm{r}}^{3+}$, has been reported. Here, we demonstrate the storage and recall of the entangled state of two telecom photons generated from an integrated photonic chip based on a silicon nitride micro-ring resonator. Combining the natural narrow linewidth of the entangled photons and long storage time of ${}^{167}\mathrm{E}{\mathrm{r}}^{3+}$ ions, we achieve storage time of 1.936 $\mu$s, more than 387 times longer than in previous works. Successful storage of entanglement in the crystal is certified by a violation of an entanglement witness with more than 23 standard deviations (-0.234 $\pm$ 0.010) at 1.936 $\mu$s storage time. These results pave the way for realizing quantum networks based on solid-state devices.

arXiv commentWe have improved the storage time of quantum entanglement to over 1.9 $\mu$s with a efficiency of about 2%, using partial nuclear spin polarization as well as better frequency locking for the laser system. We have also enhanced the coherence of signal photons, which are generated from an entangled photon-pair source based on an integrated microring resonator with a quality factor exceeding 10^6

References in corpus (68)

• The Quantum Internet
• Long-distance quantum communication with atomic ensembles and linear optics
• Entanglement detection
• Heralded entanglement between solid-state qubits separated by 3 meters
• An Elementary Quantum Network of Single Atoms in Optical Cavities
• Single-Photon Switching and Entanglement of Solid-State Qubits in an Integrated Nanophotonic System
• Integrated micro-comb sources for quantum optical applications
• Multimode quantum memory based on atomic frequency combs
• Quantum Repeaters with Photon Pair Sources and Multi-Mode Memories
• Broadband waveguide quantum memory for entangled photons
• Deterministic delivery of remote entanglement on a quantum network
• Quantum Storage of Photonic Entanglement in a Crystal
• Experimental demonstration of a BDCZ quantum repeater node
• CMOS-compatible, multiplexed source of heralded photon pairs: towards integrated quantum combs
• Optical-fiber source of polarization-entangled photon pairs in the 1550nm telecom band
• Functional Quantum Nodes for Entanglement Distribution over Scalable Quantum Networks
• Entanglement of two quantum memories via fibers over dozens of kilometres
• Coherence time of over a second in a telecom-compatible quantum memory storage material
• Telecom-heralded entanglement between remote multimode solid-state quantum memories
• Single-qubit quantum memory exceeding $10$-minute coherence time
• Quantum teleportation from a telecom-wavelength photon to a solid-state quantum memory
• Quantum storage of entangled telecom-wavelength photons in an erbium-doped optical fibre
• Chip-integrated visible-telecom photon pair sources for quantum communication
• Optical quantum nondemolition measurement of a solid-state spin without a cycling transition
• Entangling single atoms over 33 km telecom fibre
• Heralded entanglement distribution between two absorptive quantum memories
• One-hour coherent optical storage in an atomic frequency comb memory
• High quality asynchronous heralded single photon source at telecom wavelength
• Impedance-matched cavity quantum memory
• A solid state spin-wave quantum memory for time-bin qubits
• Telecommunication-wavelength solid-state memory at the single photon level
• Mapping multiple photonic qubits into and out of one solid-state atomic ensemble
• Phase-tuned entangled state generation between distant spin qubits
• Efficient quantum memory using a weakly absorbing sample
• Experimental realization of a multiplexed quantum memory with 225 individually accessible memory cells
• Coherent spin control at the quantum level in an ensemble-based optical memory
• Ultranarrow-Band Photon Pair Source Compatible with Solid State Quantum Memories and Telecommunication Networks
• Heralded quantum entanglement between two crystals
• Entanglement of spin waves among four quantum memories
• A quantum memory at telecom wavelengths
• Quantum Storage of Frequency-Multiplexed Heralded Single Photons
• Truly unentangled photon pairs without spectral filtering
• A Waveguide Frequency Converter Connecting Rubidium Based Quantum Memories to the Telecom C-Band
• Simultaneous coherence enhancement of optical and microwave transitions in solid-state electronic spins
• Entanglement of light-shift compensated atomic spin waves with telecom light
• A multiplexed light-matter interface for fibre-based quantum networks
• Cavity-enhanced quantum network nodes
• Persistent energy-time entanglement covering multiple resonances of an on-chip biphoton frequency comb
• Nanophotonic quantum storage at telecommunications wavelength
• Efficiency optimization for Atomic Frequency Comb storage
• Experimental demonstration of memory-enhanced scaling for entanglement connection of quantum repeater segments
• Long-distance multiplexed quantum teleportation from a telecom photon to a solid-state qubit
• Realizing an entanglement-based multi-user quantum network with integrated photonics
• High-Rate Photon Pairs and Sequential Time-Bin Entanglement with Si${}_3$N${}_4$ Ring Microresonators
• Remote distribution of non-classical correlations over 1250 modes between a telecom photon and a ${}^{171}$Yb${}^{3+}$:Y${}_2$SiO${}_5$ crystal
• Three-dimensional entanglement on a silicon chip
• Optical spin-wave storage in a solid-state hybridized electron-nuclear spin ensemble
• Storage and retrieval of heralded telecommunication-wavelength photons using a solid-state waveguide quantum memory
• Heterogeneously integrated, superconducting silicon-photonic platform for measurement-device-independent quantum key distribution
• Multiplexed on-demand storage of polarization qubits in a crystal
• Generation of light with multimode time-delayed entanglement using storage in a solid state spin-wave quantum memory
• On-demand storage of photonic qubits at telecom wavelengths
• Multimode capacity of atomic-frequency comb quantum memories
• The Path to Increasing the Coincidence Efficiency of Integrated Photon Sources
• Initialisation protocol for efficient quantum memories using resolved hyperfine structure
• Silicon-Nitride Platform for Narrowband Entangled Photon Generation
• Efficient optical pumping using hyperfine levels in ${}^{145}$Nd${}^{3+}$:Y${}_2$SiO${}_5$ and its application to optical storage
• Storing a single photon as a spin wave entangled with a flying photon in telecomband

Cited by in corpus (8)

• Recent advances in high-dimensional mode-locked quantum frequency combs
• Quantum networks using rare-earth ions
• Postselection-Free Cavity-Enhanced Narrow-Band Orbital Angular Momentum Entangled Photon Source
• Quantum Teleportation from Telecom Photons to Erbium-ion Ensembles
• Purcell-Enhanced Generation of Photonic Bell States via the Inelastic Scattering of Single Atoms
• Censorship of Quantum Resources in Quantum Networks
• Photo-luminescence properties of ion implanted Er3+-defects in 4H-SiCOI towards integrated quantum photonics
• Spin-photon Qubits for Scalable Quantum Network