paper / jianweipan / 10d ago
This paper presents a novel approach to Twin-Field Quantum Key Distribution (TF-QKD) that overcomes the scalability limitations of wavelength-division multiplexing (WDM) by utilizing independent dissipative Kerr soliton (DKS) microcombs. This method simplifies multi-wavelength sources by requiring only stabilization of pump wavelength and repetition rates, leading to a significant enhancement in secure key rates over long distances.
quantum-key-distributiontwin-field-qkddissipative-kerr-solitonswavelength-division-multiplexingquantum-communicationhigh-speed-qkdphotonic-integrated-circuits
“Direct implementation of WDM in TF-QKD is challenged by the need for independent ultra-stable seed lasers, narrow-linewidth transmitters, and optical phase-locked loops for each wavelength channel.”
paper / jianweipan / Mar 2
Researchers have developed a high-performance quantum frequency conversion (QFC) system that bridges the spectral gap between ultraviolet (UV) photons and the telecom C-band. This system, based on thin-film lithium niobate, exhibits a record-high external efficiency of 28.8% and ultra-low noise of 35 counts per second. This advancement is critical for enabling long-lived remote ion-ion entanglement in scalable quantum networks by allowing for efficient information transfer between quantum systems operating at different wavelengths.
quantum-frequency-conversionquantum-networksphotonicsultraviolet-telecomlithium-niobatequantum-entanglement
“A novel quantum frequency conversion (QFC) system can efficiently convert ultraviolet photons to the telecom C-band.”
paper / jianweipan / Mar 2
This paper introduces a neutral-atom quantum computing framework that addresses the challenges of cumulative motional heating and atom loss in deep quantum circuits. By integrating mid-circuit operations such as Raman sideband cooling and qubit re-initialization, the framework maintains high gate fidelities (~99.8%) across multiple operational rounds. This active management of internal and motional entropy provides a crucial pathway for scalable quantum error correction.
quantum-computingneutral-atom-circuitryquantum-error-correctionquantum-logic-gatesmid-circuit-operationsatomic-physicsquantum-physics
“The new neutral-atom framework overcomes limitations of cumulative motional heating and atom loss in deep quantum circuits.”
paper / jianweipan / Feb 10
Researchers have successfully demonstrated device-independent quantum key distribution (DI-QKD) over a 100 km fiber optic link using single atoms. This was achieved by employing single-photon interference for entanglement heralding and quantum frequency conversion to mitigate fiber loss. The experiment also utilized a Rydberg-based emission scheme to suppress photon recoil, resulting in high-fidelity atom-atom entanglement and positive asymptotic key rates.
quantum-key-distributionquantum-internetsingle-atomquantum-frequency-conversionquantum-networksquantum-physicsqkd
“Device-independent quantum key distribution (DI-QKD) has been realized between two single-atom nodes over 100 km of fiber.”
paper / jianweipan / Feb 9
Entanglement distribution in quantum networks is bottlenecked by rapid decoherence in remote memory-memory entanglement. This research addresses this by developing long-lived trapped-ion memories, an efficient telecom interface, and a high-visibility single-photon entanglement protocol. This approach enables the establishment and maintenance of memory-memory entanglement over 10 km, demonstrating viable metropolitan-scale device-independent quantum key distribution.
quantum-networksquantum-repeatersquantum-communicationentanglementquantum-memoryquantum-key-distributionquantum-physics
“The primary bottleneck in quantum repeater development is the rapid decoherence of remote memory-memory entanglement.”