Quantum Frequency Conversion of $\mu s$-long Photons from the Visible to the Telecom-C-Band

Abstract

Quantum Frequency Conversion (QFC) is a widely used technique to interface atomic systems with the telecom band in order to facilitate propagation over longer distances in fiber. Here we demonstrate the difference-frequency conversion from 606 nm to 1552 nm of microsecond-long weak coherent pulses at the single photon level compatible with Pr${}^{3+}$:Y${}_2$SiO${}_5$ quantum memories, with high-signal to noise ratio. We use a single step difference frequency generation process with a continuous-wave pump at 994 nm in a MgO:ppLN-waveguide and ultra-narrow spectral filtering down to a bandwidth of 12.5 MHz. With this setup, we achieve the conversion of weak coherent pulses of duration up to 13.6 $\mu s$ with a device efficiency of about 25% and a signal-to-noise ratio >460 for 10 $\mu s$-long pulses containing one photon on average. This signal-to-noise ratio is large enough to enable a high-fidelity conversion of qubits emitted from an emissive quantum memory based on Pr${}^{3+}$:Y${}_2$SiO${}_5$ and to realize an interface with quantum processing nodes based on narrow-linewidth cavity-enhanced trapped ions.

arXiv comment7 pages, 6 figures

References in corpus (28)

• The Quantum Internet
• Multimode quantum memory based on atomic frequency combs
• Entanglement of two quantum memories via fibers over dozens of kilometres
• Modular Entanglement of Atomic Qubits using both Photons and Phonons
• Demonstration of fault-tolerant universal quantum gate operations
• Telecom-heralded entanglement between remote multimode solid-state quantum memories
• Entanglement of Nanophotonic Quantum Memory Nodes in a Telecom Network
• Tunable ion-photon entanglement in an optical cavity
• Entangling single atoms over 33 km telecom fibre
• Entanglement of trapped-ion qubits separated by 230 meters
• High-fidelity entanglement between a trapped ion and a telecom photon via quantum frequency conversion
• Photonic quantum state transfer between a cold atomic gas and a crystal
• Multiplexed storage and real-time manipulation based on a multiple-degree-of-freedom quantum memory
• Long-distance distribution of atom-photon entanglement at telecom wavelength
• Light-matter entanglement over 50 km of optical fibre
• Quantum Storage of Frequency-Multiplexed Heralded Single Photons
• Quantum frequency conversion to telecom of single photons from a nitrogen-vacancy center in diamond
• Multi-mode and long-lived quantum correlations between photons and spins in a crystal
• Polarization insensitive frequency conversion for an atom-photon entanglement distribution via a telecom network
• A Waveguide Frequency Converter Connecting Rubidium Based Quantum Memories to the Telecom C-Band
• A telecom-wavelength quantum repeater node based on a trapped-ion processor
• Solid state source of non-classical photon pairs with embedded multimode quantum memory
• Generation of light with multimode time-delayed entanglement using storage in a solid state spin-wave quantum memory
• Time Entanglement between a Photon and a Spin Wave in a Multimode Solid-state Quantum Memory
• Efficient polarisation-preserving frequency conversion from a trapped-ion-compatible wavelength to the telecom C band
• Non-classical correlations between a C-band telecom photon and a stored spin-wave
• Efficient cavity-assisted storage of photonic qubits in a solid-state quantum memory
• Two-stage, low noise quantum frequency conversion of single photons from silicon-vacancy centers in diamond to the telecom C-band

Cited by in corpus (3)

• Uniting Quantum Processing Nodes of Cavity-coupled Ions with Rare-earth Quantum Repeaters Using Single-photon Pulse Shaping Based on Atomic Frequency Comb
• Efficient Pumping of Spectral Holes in a Tm${}^{3+}$: YAG Crystal for Broadband Quantum Optical Storage
• Fiber-integrated Quantum Frequency Conversion for Long-distance Quantum Networking