Single-photon two-degree-of-freedom entanglement generation and measurement experiment device
An experimental device and single-photon technology, applied in optics, optical components, nonlinear optics, etc., can solve problems such as limiting the application field of quantum communication, achieve the effect of improving capacity and spectrum utilization, improving application fields, and improving quality
Pending Publication Date: 2020-12-08
青岛鲲腾量子应用技术有限公司 +1
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Problems solved by technology
In the field of quantum communication, the polarization degrees of freedom of two photons are usually used as information carriers to reflect quantum entanglement, but the polarization degrees of freedom only realize the encoding of quantum in two-dimensional Hilbert space, thus limiting the application field of quantum communication
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[0084] A single-photon two-degree-of-freedom entanglement generation and measurement experimental device is based on the above modules, which can realize the generation and verification of single-photon spin-orbit angular momentum entanglement. It is described in detail as follows:
[0085] S1, start the laser 111, confirm that the associated photon source module 1 works normally, and output horizontally polarized single photons, whose orbital angular momentum is zero. Jointly rotate the major axis angles of the second quarter-wave plate 21 and the second half-wave plate 22 to output horizontally polarized single photons with stable phase and light intensity. Then the position of the orbital angular momentum unit 24 is precisely positioned so that the light beam is incident on the center of the phase plate, and the long-axis angle of the third quarter-wave plate 25 is adjusted to make the photons in an optimal phase state. So far, the conversion of single photon from spin ang...
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The invention relates to the field of quantum information and communication, in particular to a single-photon two-degree-of-freedom entanglement generation and measurement experimental device. The device comprises an associated photon source module and an entangled state preparation module which are sequentially arranged in the light path direction. The associated photon source module is used forgenerating a self-rotating single photon beam; and the entangled state preparation module is used for generating a spin orbital angular momentum entangled state single photon beam from the spin singlephoton beam, and the spin orbital angular momentum entangled state is two-degree-of-freedom entanglement. According to the invention, the information carrier is established through the spin and orbital angular momentum of the single photon, the infinite-dimension Hilbert space can be established, and is not limited to the two-dimensional Hilbert space, so that the spin and orbital angular momentum of the single photon are matched with each other, infinite bit information can be borne, and the application field of quantum communication is expanded.
Description
technical field [0001] The invention relates to the field of quantum information and communication, in particular to a single-photon double-degree-of-freedom entanglement generation and measurement experimental device. Background technique [0002] As a unique resource in the world of quantum physics, quantum entanglement has changed the way we process information. In the field of quantum communication, the polarization degrees of freedom of two photons are usually used as information carriers to reflect quantum entanglement, but the polarization degrees of freedom only realize the encoding of quantum in two-dimensional Hilbert space, thus limiting the application field of quantum communication . Contents of the invention [0003] In order to solve the above technical problems, the present invention provides an experimental device for generating and measuring single-photon two-degree-of-freedom entanglement. By introducing photon orbital angular momentum, a single photon ...
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Login to View More IPC IPC(8): G02B27/28G02F1/35G02F1/355
CPCG02B27/283G02B27/286G02F1/3501G02F1/3551
Inventor 周志远毛昉李银海
Owner 青岛鲲腾量子应用技术有限公司