English

The LANL laboratory in the United States uses quantum light emitters to generate single photon light sources

176
2023-09-01 14:00:44
See translation

Recently, the Los Alamos National Laboratory (LANL) in the United States has developed a method for quantum light emitters, which stacks two different atomic thin materials together to achieve a light source that generates circularly polarized single photon streams. These light sources can also be used for various quantum information and communication applications.

According to Han Htoon, a researcher at Los Alamos, this work shows that single-layer semiconductors can emit circularly polarized light without the need for an external magnetic field.

Previously, this effect could only be achieved through the high magnetic field generated by bulky superconducting magnets, coupling quantum emitters to very complex nanoscale photonic structures, or injecting spin polarized charge carriers into quantum emitters. Our proximity effect method has the advantages of low manufacturing cost and high reliability.

Polarization is a means of encoding photons, therefore this achievement is an important step in the direction of quantum cryptography or quantum communication. With a light source that generates a single photon stream and introduces polarization, we basically merge the two devices into one.

The research team stacked a single molecule thick layer of tungsten selenide semiconductor onto a thicker layer of nickel phosphorus trisulfide magnetic semiconductor. Using atomic force microscopy, the research team created a series of nanoscale indentations on thin layer materials.

When the laser is focused on the material pile, the 400 nanometer diameter indentation generated by the atomic microscope tool has two effects. Firstly, the indentation forms a "well" or "depression" in the potential energy landscape. The electrons of the tungsten selenide monolayer fall into the depression. This stimulates the emission of a single photon from the well.

Nanoindentation also disrupts the typical magnetic properties of the underlying nickel phosphorus trisulfide crystal, generating local magnetic moments pointing outward from the material. This magnetic moment circularly polarizes the emitted photons. In order to experimentally confirm this mechanism, the team first collaborated with the pulse field facility of the Los Alamos National High Magnetic Field Laboratory to conduct high magnetic field spectroscopy experiments. Then, the team collaborated with the University of Basel in Switzerland to measure the tiny magnetic field of the local magnetic moment.

The team is currently exploring methods to adjust the degree of circular polarization of single photons through electronic or microwave stimulation. This capability will provide a method for encoding quantum information into photon streams. Further coupling between photon flow and waveguide will provide photon circuits, allowing photons to propagate in one direction. This circuit will become a fundamental component of the ultra secure quantum internet.

Source: OFweek

Related Recommendations
  • Snapmaker introduces new 20W and 40W laser modules

    Snapmaker has opened pre-orders for 20W and 40W laser modules, which are significant upgrades to the modules available on existing Snapmaker machines.Snapmaker says that with the 40W module installed, you will be able to cut 15 mm basswood plywood at a time at a speed of 20 mm/SEC. With 20W, you will cut 10mm at a rate of 10mm/SEC. That's a lot more than Artisan and Snapmaker 2.0 - both are comp...

    2023-08-04
    See translation
  • DataLase launches a new laser active transparent to white coating

    Laser coding and marking technology expert DataLase has launched a series of new colorless to white coatings for a range of packaging applications.These coatings are centered around biodegradable and sustainably sourced raw materials, providing high contrast white printing even on difficult substrates such as 12 micron PET and shrink film, under the weight of flexographic and gravure coatings. Thi...

    2024-03-09
    See translation
  • Cobot Systems announces the establishment of a partnership between UR+and its laser welding collaborative robot system

    Cobot Systems announced that it has now become a UR+partner and showcased laser welding unit systems. This honor marks an important milestone in the company's journey of providing widely available automated labor solutions. This approval highlights Cobot Systems' commitment to providing innovative solutions compatible with UoRobot (UR) products, ensuring seamless collaboration with integrated lase...

    2024-05-16
    See translation
  • Atomstack Maker A5 V2: A laser engraving machine suitable for beginners

    In the recent DIY field, innovative and increasingly affordable laser engraving machines have emerged, mainly designed for first-time users in this field. A particularly noteworthy example in this regard is the Atomstack Maker A5 V2 model. This device is known for its versatility and ease of use, making it an ideal choice for beginners in the world of laser engraving.The Atomstack Maker A5 V2 is a...

    2024-01-03
    See translation
  • Researchers use liquid metal and laser ablation to create stretchable micro antennas

    Researchers have developed a new method of making micro stretchable antenna with water gel and liquid metal. These antennas can be used for wearable and flexible wireless electronic devices to provide links between devices and external systems for power transmission, data processing, and communication.Using our new manufacturing method, we have demonstrated that the length of liquid metal antennas...

    2023-09-19
    See translation