Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

« Quantum phase-locking, 1/f noise and entanglement », Advanced Experimental Methods for Noise Research in Nanoscale Electronic Devices.

Michel R. P. Planat, Haret Codratian Rosu

Published Jan 1, 2003• 0 citations
OpenAlex

Related papers

Quantum Noise in Phase Measurement

WORLD SCIENTIFIC eBooks•Jul 4, 2017•0 citations

High Visibility Time-Energy Entangled Photons from a Silicon Nanophotonic Chip

Steven D. Rogers, Daniel Mulkey, Xiyuan Lu +2 more

Advances in quantum photonics have shown that chip-scale quantum devices are translating from the realm of basic research to applied technologies. Recent developments in integrated photonic circuits and single photon detectors indicate that the bottleneck for fidelity in quantum photonic processes will ultimately lie with the photon sources. We present and demonstrate a silicon nanophotonic chip capable of emitting telecommunication band photon pairs that exhibit the highest raw degree of time-energy entanglement from a micro/nanoscale source, to date. Biphotons are generated through cavity-enhanced spontaneous four-wave mixing (SFWM) in a high-Q silicon microdisk resonator, wherein the nature of the triply resonant generation process leads to a dramatic Purcell enhancement, resulting in highly efficient pair creation rates as well as extreme suppression of the photon noise background. The combination of the excellent photon source and a new phase locking technique allow for the observation of a nearly perfect coincidence visibility of (96.6 ± 1.1)%, without any background subtraction, at a large pair generation rate of (4.40 ± 0.07) × 10 5 pairs/s.

arXiv:1605.06540•ACS Photonics•Oct 4, 2016•32 citations

Nanoscale NbN/TaN/NbN Josephson junctions for superconducting memory cells

Zengxu Zheng, Lu Zhang, Y X Hu +8 more

Abstract Superconducting flux memory devices fabricated with nanoscale junctions and high-inductance materials can maintain high-speed access performance while significantly reducing the area required for superconducting loops. In this work, we present a method for preparing nanoscale NbN-based superconductor/normal-metal/superconductor (SNS) Josephson junctions that combines electron beam lithography with chemical mechanical planarization process. Scanning electron microscope images reveal that the junction has a very round shape, while cross-sectional transmission electron microscopy shows that it has a truncated cone structure, characterized by a narrow top and a wide bottom. The minimum diameter of the junction is 51 nm, with the diameter at the interface between the wiring layer and the top electrode being just 27 nm. These nanoscale junctions exhibit excellent Josephson properties with a critical current density J c of 673 ± 64 kA cm −2 and a characteristic voltage V c of 1.63 ± 0.45 mV at 4.2 K. Furthermore, we designed the superconducting memory cell based on the simulated inductance values of the NbN loop and the nanoscale NbN-based SNS junctions. The cell has a total area of 12.6 μ m × 6.5 μ m and contains a radio-frequency superconducting quantum interference device with one junction in the storage loop and a direct-current superconducting quantum interference device with two junctions in the readout loop. Using the flux-locked and feedback measurement method, a clear flux hysteresis curve can be obtained to verify the read-write functions of the device.

Superconductor Science and Technology•Sep 1, 2025•1 citation

Electron interference and entanglement in coupled 1D systems with noise

Fabrizio Buscemi, Paolo Bordone, Andrea Bertoni

arXiv:1207.4285•The European Physical Journal D•Dec 1, 2012•11 citations

Phase-Locked Quantum Anomaly Detection (PLQAD)

Jincheng Zhang

Quantum entanglement is a cornerstone of modern quantum technologies, underpinning secure communication and complex computation. However, the inherent fragility of entangled states makes them susceptible to subtle disturbances that can be difficult to detect. This paper introduces Phase-Locked Quantum Anomaly Detection (PLQAD), a novel system for identifying anomalies in entangled states through the analysis of phase-locked patterns. We propose a new algorithm that leverages advanced statistical techniques to effectively pinpoint deviations from expected entanglement behavior, offering a significantly faster and more precise anomaly detection method compared to existing approaches. The core of the system involves meticulously tracking and analyzing entanglement patterns, identifying deviations indicative of potential errors or disturbances. This research represents a fundamental step toward enhancing the robustness and reliability of quantum systems.

•Aug 29, 2026•0 citations

Characterization and control of non-Markovian quantum noise

Gregory A. L. White

Nature Reviews Physics•Mar 31, 2022•5 citations
Advances in quantum photonics have shown that chip-scale quantum devices are translating from the realm of basic research to applied technologies. Recent developments in integrated photonic circuits and single photon detectors indicate that the bottleneck for fidelity in quantum photonic processes will ultimately lie with the photon sources. We present and demonstrate a silicon nanophotonic chip capable of emitting telecommunication band photon pairs that exhibit the highest raw degree of time-energy entanglement from a micro/nanoscale source, to date. Biphotons are generated through cavity-enhanced spontaneous four-wave mixing (SFWM) in a high-Q silicon microdisk resonator, wherein the nature of the triply resonant generation process leads to a dramatic Purcell enhancement, resulting in highly efficient pair creation rates as well as extreme suppression of the photon noise background. The combination of the excellent photon source and a new phase locking technique allow for the observation of a nearly perfect coincidence visibility of (96.6 ± 1.1)%, without any background subtraction, at a large pair generation rate of (4.40 ± 0.07) × 10 5 pairs/s.
Abstract Superconducting flux memory devices fabricated with nanoscale junctions and high-inductance materials can maintain high-speed access performance while significantly reducing the area required for superconducting loops. In this work, we present a method for preparing nanoscale NbN-based superconductor/normal-metal/superconductor (SNS) Josephson junctions that combines electron beam lithography with chemical mechanical planarization process. Scanning electron microscope images reveal that the junction has a very round shape, while cross-sectional transmission electron microscopy shows that it has a truncated cone structure, characterized by a narrow top and a wide bottom. The minimum diameter of the junction is 51 nm, with the diameter at the interface between the wiring layer and the top electrode being just 27 nm. These nanoscale junctions exhibit excellent Josephson properties with a critical current density J c of 673 ± 64 kA cm −2 and a characteristic voltage V c of 1.63 ± 0.45 mV at 4.2 K. Furthermore, we designed the superconducting memory cell based on the simulated inductance values of the NbN loop and the nanoscale NbN-based SNS junctions. The cell has a total area of 12.6 μ m × 6.5 μ m and contains a radio-frequency superconducting quantum interference device with one junction in the storage loop and a direct-current superconducting quantum interference device with two junctions in the readout loop. Using the flux-locked and feedback measurement method, a clear flux hysteresis curve can be obtained to verify the read-write functions of the device.
Quantum entanglement is a cornerstone of modern quantum technologies, underpinning secure communication and complex computation. However, the inherent fragility of entangled states makes them susceptible to subtle disturbances that can be difficult to detect. This paper introduces Phase-Locked Quantum Anomaly Detection (PLQAD), a novel system for identifying anomalies in entangled states through the analysis of phase-locked patterns. We propose a new algorithm that leverages advanced statistical techniques to effectively pinpoint deviations from expected entanglement behavior, offering a significantly faster and more precise anomaly detection method compared to existing approaches. The core of the system involves meticulously tracking and analyzing entanglement patterns, identifying deviations indicative of potential errors or disturbances. This research represents a fundamental step toward enhancing the robustness and reliability of quantum systems.