Search research articles

ABOUT JoVE

Overview Leadership Blog JoVE Help Center

AUTHORS

Publishing Process Editorial Board Scope & Policies Peer Review FAQ Submit

LIBRARIANS

Testimonials Subscriptions Access Resources Library Advisory Board FAQ

RESEARCH

JoVE Journal Methods Collections JoVE Encyclopedia of Experiments Archive

EDUCATION

JoVE Core JoVE Business JoVE Science Education JoVE Lab Manual Faculty Resource Center Faculty Site

Terms & Conditions of Use

Related Concept Videos

Time and frequency -Domain Interpretation of Phase-lag Control

Time and frequency -Domain Interpretation of Phase-lag Control

Phase-lag controllers are widely used in control systems to improve stability and reduce steady-state errors. A dimmer switch controlling the brightness of a light bulb serves as a practical example of phase-lag control, gradually adjusting the bulb's brightness. Mathematically, phase-lag control or low-pass filtering is represented when the factor 'a' is less than 1.
Phase-lag controllers do not place a pole at zero, but instead influence the steady-state error by amplifying any...

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by

Same author

Generation of 10-dB squeezed light from a broadband waveguide optical parametric amplifier with improved phase locking method.

Optics express·2026

Same author

Analytical fidelity calculations for photonic linear cluster state generation.

Nano convergence·2025

Same author

All-optical measurement-device-free feedforward enabling ultra-fast quantum information processing.

Optics express·2025

Same author

Optically sampled superconducting-nanostrip photon-number resolving detector for non-classical quantum state generation.

Optics express·2025

Same author

Research on Quantum Materials and Quantum Technology at RIKEN.

ACS nano·2025

Same author

Generation of multi-photon Fock states at telecommunication wavelength using picosecond pulsed light.

Optics express·2024

Same journal

Erratum: Bacterial Turbulence at Compressible Fluid Interfaces [Phys. Rev. Lett. 136, 138301 (2026)].

Physical review letters·2026

Same journal

Unveiling Light-Quark Yukawa Flavor Structure via Dihadron Fragmentation at Lepton Colliders.

Physical review letters·2026

Same journal

Adaptable Route to Fast Coherent State Transport via Bang-Bang-Bang Protocols.

Physical review letters·2026

Same journal

Topological Transition and Emergence of Elasticity of Dislocation in Skyrmion Lattice: Beyond Kittel's Magnetic-Polar Analogy.

Physical review letters·2026

Same journal

Pound-Drever-Hall Method for Superconducting-Qubit Readout.

Physical review letters·2026

Same journal

Coupling a ^{73}Ge Nuclear Spin to an Electrostatically Defined Quantum Dot in Silicon.

Physical review letters·2026

See all related articles

Search research articles

Related Experiment Video

Updated: Nov 21, 2025

Gradient Echo Quantum Memory in Warm Atomic Vapor

Gradient Echo Quantum Memory in Warm Atomic Vapor

Published on: November 11, 2013

Phase Locking between Two All-Optical Quantum Memories.

Fumiya Okamoto¹, Mamoru Endo¹, Mikihisa Matsuyama¹

¹Department of Applied Physics, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.

Physical Review Letters

|January 15, 2021

Summary

This summary is machine-generated.

Researchers achieved controlled release of entangled single-photon states from two quantum memories. This breakthrough in optical quantum computing preserves entanglement and nonclassicality for independent release times up to 400 nanoseconds.

More Related Videos

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators

Published on: May 30, 2014

Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements

Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements

Published on: February 28, 2016

Related Experiment Videos

Last Updated: Nov 21, 2025

Gradient Echo Quantum Memory in Warm Atomic Vapor

Gradient Echo Quantum Memory in Warm Atomic Vapor

Published on: November 11, 2013

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators

Published on: May 30, 2014

Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements

Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements

Published on: February 28, 2016

Area of Science:

Quantum Information Science
Quantum Optics
Quantum Computing

Background:

Controlled generation of multimode photonic quantum states is crucial for optical quantum computation.
Existing methods face challenges in precisely timing the release of entangled photon states.

Purpose of the Study:

To experimentally demonstrate phase locking of two all-optical quantum memories.
To achieve time-controlled release of two-mode entangled single-photon states.
To verify the preservation of entanglement and nonclassicality for independently controlled release times.

Main Methods:

Utilized a concatenated cavity system with phase reference beams for quantum memory phase locking.
Employed time-controlled release mechanisms for independent manipulation of photon modes.
Characterized the generated quantum states using two-mode optical homodyne tomography.

Main Results:

Successfully demonstrated phase locking of two all-optical quantum memories.
Achieved independent control over the release time of entangled single-photon states.
Preserved entanglement and nonclassicality for release-time differences up to 400 nanoseconds, verified by logarithmic negativities and Wigner-function negativities.

Conclusions:

The demonstrated technique enables precise temporal control over entangled photonic states.
This method is a significant step towards building scalable optical quantum computers.
The preservation of quantum properties ensures the fidelity of quantum information processing.