Noise suppression in a temporal-multimode quantum memory entangled with a photon via asymmetrical photon-collection channel
arXiv:2111.00381 · doi:10.1103/PhysRevA.106.022610
Abstract
Quantum interfaces (QIs) that generate entanglement between a multimode atomic memory and a photon forms a multiplexed repeater node and hold promise to greatly improve quantum repeater rates. Recently, the temporal multimode spin-wave memory that is entangled with a photon has been demonstrated with cold atoms. However, due to additional noise generated in multimode operation, the fidelity of spin-wave-photon entanglement significantly decreases with the mode number. So far, the improvement on temporal-multimode entanglement fidelity via suppressing the additional noise remains unexplored. Here, we propose and experimentally demonstrate a scheme that can suppress the additional noise of a temporally-multiplexed QI. The scheme uses an asymmetric channel to collect the photons coming and retrieving from the temporally-multiplexed QI. For making comparisons, we also set up a QI that uses symmetric channel for the photon collections. When the QIs store 14 modes, the measured Bell parameter S for the QIs using the asymmetric and the symmetric photon-collection channels are 2.36+/-0.03 and 2.24+/-0.04, respectively, showing that the QI using the asymmetric channel gives rise to a 3% increase in entanglement fidelity, i.e., a 1.7-fold decrease in the additional noise, compared with the QI using the symmetric one. On the other hand, the 14-mode entanglement QIs that use the asymmetric and symmetric collections preserve the violation of a Bell inequality for storage times up to 25 us and 20 us, respectively, showing that the asymmetric QI has a higher entanglement storage performance.
References in corpus (70)
- The Quantum Internet
- Long-distance quantum communication with atomic ensembles and linear optics
- Generation of Nonclassical Photon Pairs for Scalable Quantum Communication with Atomic Ensembles
- Quantum Repeaters with Photon Pair Sources and Multi-Mode Memories
- Measurement-Induced Entanglement for Excitation Stored in Remote Atomic Ensembles
- Broadband waveguide quantum memory for entangled photons
- Quantum Storage of Photonic Entanglement in a Crystal
- Experimental demonstration of a BDCZ quantum repeater node
- Towards a global quantum network
- Heralded Entanglement between Atomic Ensembles: Preparation, Decoherence, and Scaling
- Entanglement of two quantum memories via fibers over dozens of kilometres
- Distribution of time-bin qubits over 50 km of optical fiber
- Quantum State Transfer Between Matter and Light
- Spectral multiplexing for scalable quantum photonics using an atomic frequency comb quantum memory and feed-forward control
- High efficiency coherent optical memory with warm rubidium vapour
- Multiplexed Memory-Insensitive Quantum Repeaters
- Quantum teleportation from a telecom-wavelength photon to a solid-state quantum memory
- A millisecond quantum memory for scalable quantum networks
- Quantum storage of entangled telecom-wavelength photons in an erbium-doped optical fibre
- Efficient and long-lived quantum memory with cold atoms inside a ring cavity
- Memory-built-in quantum teleportation with photonic and atomic qubits
- Robust creation of entanglement between remote memory qubits
- An efficient quantum light-matter interface with sub-second lifetime
- Mapping multiple photonic qubits into and out of one solid-state atomic ensemble
- Entanglement of a photon and a collective atomic excitation
- Experimental realization of a multiplexed quantum memory with 225 individually accessible memory cells
- Highly-Efficient Quantum Memory for Polarization Qubits in a Spatially-Multiplexed Cold Atomic Ensemble
- Interfacing Collective Atomic Excitations and Single Photons
- Robust and Efficient Quantum Repeaters with Atomic Ensembles and Linear Optics
- Long-distance distribution of atom-photon entanglement at telecom wavelength
- Highly multimode memory in a crystal
- A fast and robust approach to long-distance quantum communication with atomic ensembles
- A Robust Atom-Photon Entanglement Source for Quantum Repeaters
- Quantum Storage of Frequency-Multiplexed Heralded Single Photons
- Fault-tolerant quantum repeater with atomic ensembles and linear optics
- Storage of multiple single-photon pulses emitted from a quantum dot in a solid-state quantum memory
- Multi-mode and long-lived quantum correlations between photons and spins in a crystal
- Quantum teleportation between remote atomic-ensemble quantum memories
- 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
- Entanglement of light-shift compensated atomic spin waves with telecom light
- Long lifetime and high-fidelity quantum memory of photonic polarization qubit by lifting Zeeman degeneracy
- A multiplexed light-matter interface for fibre-based quantum networks
- Direct measurement of decoherence for entanglement between a photon and stored atomic excitation
- Efficient retrieval of a single excitation stored in an atomic ensemble
- Control of decoherence in the generation of photon pairs from atomic ensembles
- Solid state source of non-classical photon pairs with embedded multimode quantum memory
- Coherent Storage of Temporally Multimode Light Using a Spin-Wave Atomic Frequency Comb Memory
- Entanglement between a telecom photon and an on-demand multimode solid-state quantum memory
- Quantum correlations between single telecom photons and a multimode on-demand solid state quantum memory
- A cold atom temporally multiplexed quantum memory with cavity-enhanced noise suppression
- Multiplexed on-demand storage of polarization qubits in a crystal
- Experimental entanglement of 25 individually accessible atomic quantum interfaces
- Experimental realization of 105-qubit random access quantum memory
- Efficient spatially-resolved multimode quantum memory
- Purification of Single-photon Entanglement
- Room-temperature single-photon source with near-millisecond built-in memory
- Highly Retrievable Spinwave-Photon Entanglement Source
- Spatial multiplexing of atom-photon entanglement sources using feed-forward controls and switching networks
- Time Entanglement between a Photon and a Spin Wave in a Multimode Solid-state Quantum Memory
- A Hybrid Quantum Memory Enabled Network at Room Temperature
- Controlled rephasing of single collective spin excitations in a cold atomic quantum memory
- Entanglement between a photonic time-bin qubit and a collective atomic spin excitation
- Temporally multiplexed quantum repeaters with atomic gases
- Einstein-Podolsky-Rosen Energy-Time Entanglement of Narrowband Biphotons
- Heralded distribution of single-photon path entanglement
- Long-lived non-classical correlations for scalable quantum repeaters at room temperature
- Multiplexed spin-wave-photon entanglement source using temporal-multimode memories and feedforward-controlled readout
- Simultaneous generation of two spin-wave-photon entangled states in an atomic ensemble
- Long-lived and multiplexed atom-photon entanglement interface with feed-forward-controlled readouts