Related Experiment Video
Updated: Aug 6, 2026
09:23
Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
Published on: May 30, 2014
Direct, loss-tolerant characterization of nonclassical photon statistics
Daryl Achilles1, Christine Silberhorn, Ian A Walmsley
1Clarendon Laboratory, University of Oxford, Parks Road, Oxford, OX1 3PU, United Kingdom. daryl.achilles@physis.ox.ac.uk
Physical Review Letters
|August 16, 2006
Summary
Researchers developed a loss-tolerant method to characterize nonclassical light beams using standard binary detectors. This technique calibrates detectors for accurate photon-number distribution measurements in a single step.
Area of Science:
- Quantum optics
- Quantum information science
Background:
- Characterizing nonclassical light is crucial for quantum technologies.
- Existing methods for photon-number distribution measurement are often sensitive to photon loss.
- Losses degrade the performance of quantum communication and computation systems.
Purpose of the Study:
- To develop a direct characterization method for photon-number distributions of nonclassical light.
- To create a technique that is tolerant to photon losses.
- To utilize only standard binary detectors for practical implementation.
Main Methods:
- Experimental investigation of a novel characterization technique.
- Single-measurement approach for determining photon-number distribution.
- Detector calibration using prior source information.
- Demonstration on a heralded two-photon-number state generated via parametric down-conversion.
Main Results:
- Successful direct characterization of photon-number distribution.
- Demonstrated loss tolerance of the developed method.
- Validation using a heralded two-photon-number state.
- Achieved accurate measurements with standard binary detectors.
Conclusions:
- The proposed method offers a robust way to characterize nonclassical light.
- This technique simplifies photon-number distribution measurement, making it more accessible.
- It has potential applications in advancing quantum technologies that rely on nonclassical light sources.
Related Concept Videos
02:39Emission Spectra
When solids, liquids, or condensed gases are heated sufficiently, they radiate some of the excess energy as light. Photons produced in this manner have a range of energies, and thereby produce a continuous spectrum in which an unbroken series of wavelengths is present.
01:23Lossless Lines
In electrical engineering, a lossless transmission line is characterized by a purely imaginary propagation constant and a resistive characteristic impedance. The ABCD parameters, which describe the relationship between the input and output voltages and currents, indicate an equivalent π circuit with an imaginary series impedance and a shunt admittance. This results in a transmission line that, when the product of the phase constant (beta) and the length of the line is less than pi, exhibits...
02:26Photoelectric Effect
When light of a particular wavelength strikes a metal surface, electrons are emitted. This is called the photoelectric effect. The minimum frequency of light that can cause such emission of electrons is called the threshold frequency, which is specific to the metal. Light with a frequency lower than the threshold frequency, even if it is of high intensity, cannot initiate the emission of electrons. However, when the frequency is higher than the threshold value, the number of electrons ejected...
00:59Propagation of Uncertainty from Random Error
An experiment often consists of more than a single step. In this case, measurements at each step give rise to uncertainty. Because the measurements occur in successive steps, the uncertainty in one step necessarily contributes to that in the subsequent step. As we perform statistical analysis on these types of experiments, we must learn to account for the propagation of uncertainty from one step to the next. The propagation of uncertainty depends on the type of arithmetic operation performed on...
02:12The 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.
01:22Lossy Lines and Overvoltages
Transmission-line series resistance and shunt conductance cause three primary effects: attenuation, distortion, and power losses.
Attenuation
When constant series resistance and shunt conductance are present, voltage and current equations are modified. The propagation constant indicates that voltage and current waves consist of both forward and backward traveling components. These waves attenuate as they propagate, with the attenuation factor related to the resistance and conductance. In a...
Attenuation
When constant series resistance and shunt conductance are present, voltage and current equations are modified. The propagation constant indicates that voltage and current waves consist of both forward and backward traveling components. These waves attenuate as they propagate, with the attenuation factor related to the resistance and conductance. In a...