English

Researchers have discovered new multiphoton effects in quantum interference of light

495
2024-01-24 11:44:07
See translation

An international research team from Leibniz University in Hanover and Strathclyde University in Glasgow overturned the previous hypothesis about the influence of multiphoton components in the thermal field and the interference effect of parameterized single photons. The journal Physical Review Letters published the team's research.

"We have demonstrated through experiments that the interference effect between thermal light and parametric single photons can also lead to quantum interference with the background field. For this reason, the background cannot be simply ignored and subtracted from the calculation, as has been the case so far," said Professor Michael Kues, Director of the Institute of Photonics at Leibniz University in Hanover and member of the board of directors of the Phoenix D Excellence Cluster.

The leading scientist is doctoral student Anahita Khodadad Kashi, who is engaged in research on photon quantum information processing at the Institute of Photonics. She studied how the visibility of the so-called Hong Ou Mandel effect is affected by multiphoton pollution.

"Through our experiment, we have overturned the previously valid assumption that the multiphoton component only damages visibility and can therefore be subtracted from the calculation," said Khodadad Kashi. We have discovered a new fundamental feature that has not been considered in previous calculations. Our newly developed model can predict quantum interference, and we can measure this effect in experiments.

Scientists discovered their findings while conducting experiments in the laser laboratory. When they initially followed the original calculation method, they obtained negative results. "But the result is physically impossible," said Khodadad Kashi. The team started troubleshooting the experimental setup and computational model together.

"When the experimental results deviate significantly from expectations, scientists begin to question previous hypotheses and seek new explanations," Kuss said.

They jointly developed a new thermal field quantum interference theory, which uses parameterized single photons. Lucia Caspani, a quantum researcher at Strathclyde University in Glasgow, was the first to test this method. Next, Khodadad Kashi presented her theory and experimental results at an international conference, including the Photonics West held in San Francisco. There, she discussed her model with other scientists and obtained confirmation of her results.

Through new theories and experimental verification, Kues's team has made significant contributions to a better understanding of quantum phenomena. "These findings may be important for quantum key distribution, which is necessary for future secure communication, especially how to explain quantum interference effects to generate keys," said Khodadad Kashi.

However, many questions remain unanswered, Kues said. There is little research on the multiphoton effect, so a lot of work still needs to be done.

Source: Laser Net

Related Recommendations
  • The fiber laser system overcomes outdated issues through a PC based EtherCAT control platform

    In order to maintain relevance and success, companies with a long history must respect their past while not ignoring the future. This is the method adopted by Cincinnati Corporation (CI), a metal processing machinery manufacturer based in Harrison, Ohio, since its establishment in the late 1890s.The company is carefully considering technological changes. Incorrect selection of control hardware, ne...

    2024-05-25
    See translation
  • Shanghai Optics and Machinery Institute has made progress in the research of new terahertz sources based on Yb lasers

    Recently, the State Key Laboratory of Intense Field Laser Physics of the Chinese Academy of Sciences Shanghai Institute of Optics and Fine Mechanics has made new progress in generating intense field terahertz waves based on Yb laser pumped organic crystals. The relevant research results were published in Applied Physics Letters under the title "Efficient strong field THz generation from DSTMS crys...

    2024-04-09
    See translation
  • The Danish authorities have approved the sale of this laser manufacturer to Hamamatsu, Japan

    On May 6, 2024 local time, the Danish Business Administration (DBA) approved the sale of NKT Photonics to Photonics Management Europe S.R.L, a wholly-owned subsidiary of Hamamatsu Photonics K.K.On that day, Hamamatsu Photonics received a notice from the Danish Business Administration stating that the acquisition had been approved:(Source: The Danish Business Authority)NKT Photonics stated that the...

    2024-05-09
    See translation
  • Overview of Ultra Short Pulse Laser Processing of Wide Bandgap Semiconductor Materials

    Professor Zhang Peilei's team from Shanghai University of Engineering and Technology, in collaboration with the research team from Warwick University and Autuch (Shanghai) Laser Technology Co., Ltd., published a review paper titled "A review of ultra shot pulse laser micromachining of wide bandgap semiconductor materials: SiC and GaN" in the international journal Materials Science in Semiconductor...

    2024-07-30
    See translation
  • Shanghai Microsystems Institute has developed a high-speed photon detector with distinguishable photon numbers

    Recently, Li Hao and You Lixing's team from the Chinese Academy of Sciences Shanghai Institute of Microsystems and Information Technology developed an ultrahigh speed, photon number resolvable optical quantum detector with a maximum count rate of 5GHz and a photon number resolution of 61 by using the sandwich structure superconducting nanowires and multi wires working in parallel. The related rese...

    2024-07-12
    See translation