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Related Concept Videos

Sampling Continuous Time Signal01:11

Sampling Continuous Time Signal

In signal processing, a continuous-time signal can be sampled using an impulse-train sampling technique, followed by the zero-order hold method. Impulse-train sampling involves the use of a periodic impulse train, which consists of a series of delta functions spaced at regular intervals determined by the sampling period. When a continuous-time signal is multiplied by this impulse train, it generates impulses with amplitudes corresponding to the signal's values at the sampling points.
In the...
Continuous Charge Distributions01:17

Continuous Charge Distributions

Imagine a bucket of water. It contains many molecules, of the order of 1026 molecules. Thus, although it contains discrete elements (molecules) at the microscopic level, macroscopically, it can be considered continuous. Small volume elements of water, infinitesimal compared to the bulk of the bucket's volume, still contain many molecules. Under this framework, quantized matter is approximated as continuous for practical purposes.
The electric charge can also be subjected to an analogical...
The Wave Nature of Light02:12

The Wave Nature of Light

The nature of light has been a subject of inquiry since antiquity. In the seventeenth century, Isaac Newton performed experiments with lenses and prisms and was able to demonstrate that white light consists of the individual colors of the rainbow combined together. Newton explained his optics findings in terms of a "corpuscular" view of light, in which light was composed of streams of extremely tiny particles traveling at high speeds according to Newton's laws of motion.
Continuous -time Fourier Transform01:11

Continuous -time Fourier Transform

The Fourier series is instrumental in representing periodic functions, offering a powerful method to decompose such functions into a sum of sinusoids. This technique, however, necessitates modification when applied to nonperiodic functions. Consider a pulse-train waveform consisting of a series of rectangular pulses. When these pulses have a finite period, they can be accurately represented by a Fourier series. Yet, as the period approaches infinity, resulting in a single, isolated pulse, the...
The Quantum-Mechanical Model of an Atom02:45

The Quantum-Mechanical Model of an Atom

Shortly after de Broglie published his ideas that the electron in a hydrogen atom could be better thought of as being a circular standing wave instead of a particle moving in quantized circular orbits, Erwin Schrödinger extended de Broglie’s work by deriving what is now known as the Schrödinger equation. When Schrödinger applied his equation to hydrogen-like atoms, he was able to reproduce Bohr’s expression for the energy and, thus, the Rydberg formula governing hydrogen spectra. Schrödinger...
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Basic Continuous Time Signals

Basic continuous-time signals include the unit step function, unit impulse function, and unit ramp function, collectively referred to as singularity functions. Singularity functions are characterized by discontinuities or discontinuous derivatives.
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Related Experiment Video

Updated: Jun 5, 2026

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
09:23

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

Published on: May 30, 2014

Transporting continuous quantum variables of individual light pulses.

Yujiro Eto1, Yun Zhang, Takuya Hirano

  • 1Department of Physics, Gakushuin University, Tokyo, Japan. eto@qo.phys.gakushuin.ac.jp

Optics Express
|January 26, 2011
PubMed
Summary

We achieved quantum variable transport for light pulses using continuous-variable Bell measurements. This method surpassed classical limits, demonstrating a fidelity of F = 0.57±0.03 with entanglement.

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Area of Science:

  • Quantum optics
  • Quantum information science

Background:

  • Quantum information requires robust methods for transferring quantum states.
  • Continuous-variable (CV) quantum information offers unique advantages for certain applications.

Purpose of the Study:

  • To experimentally demonstrate the transport of continuous quantum variables of light pulses.
  • To achieve high-fidelity quantum state transfer at telecommunication wavelengths.

Main Methods:

  • Utilized continuous-variable Bell measurements with time-domain pulsed homodyne detectors.
  • Employed post-processing displacement techniques for quantum variable reconstruction.
  • Leveraged entanglement to enhance the transport fidelity.

Main Results:

  • Successfully transported quantum variables of individual light pulses pulse-by-pulse.
  • Achieved an experimental fidelity of F = 0.57±0.03.
  • Demonstrated fidelity exceeding the classical bound of F(c) = 0.5 in the absence of entanglement.

Conclusions:

  • Experimental demonstration of CV quantum variable transport for light pulses.
  • Entanglement-assisted transport significantly improves fidelity beyond classical capabilities.
  • Potential for secure quantum communication protocols at telecommunication wavelengths.