Device and method for directly measuring photon polarization density matrix
A photon polarization and measuring device technology, which is applied in measuring devices, optical radiation measurement, measuring the polarization of light, etc., can solve the problem that quantum tomography cannot provide quantum physical coherence methods
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specific Embodiment approach 1
[0027] Specific implementation mode one: combine Figure 1 to Figure 3 Describe this embodiment mode, a kind of direct measurement device of photon polarization density of state matrix described in this embodiment mode, comprises the first state converter 2, the diagonal polarization dependent displacement crystal 3, the second state converter 4, the first convex lens 7. The second convex lens 8, the third state switch 9 and the CCD camera 10;
[0028] The signal to be measured is incident to the first state converter 2, the signal to be measured converted by the first state converter 2 is incident to the diagonal polarization dependent displacement crystal 3, and the signal to be measured converted by the diagonal polarization dependent displacement crystal 3 is incident to the second state converter 4, the signal to be measured converted by the second state converter 4 is incident on the imaging system 11, and the signal to be measured output by the imaging system 11 is inci...
specific Embodiment approach 2
[0075] Specific embodiment 2: This embodiment is to further limit the direct measurement device of a photon polarization density of state matrix described in specific embodiment 1. In this embodiment, it also includes a first mirror 5 and a second mirror 6 ;
[0076] Both the first mirror 5 and the second mirror 6 are arranged on the optical path between the second state switch 4 and the first convex lens 7 .
[0077] In this embodiment, the first reflective mirror 5 and the second reflective mirror 6 are added to assist the outgoing light emitted by the second state switch 4 to enter the first convex lens 7 .
specific Embodiment approach 3
[0078] Specific embodiment three: the measurement method based on the direct measurement device of a photon polarization density of state matrix described in specific embodiment one,
[0079] The measurement method includes the following steps:
[0080] Step 1, adjust the first state converter 2, add the first vertical polarization-related displacement crystal 2-1 to the optical path; adjust the second state converter 4, and add the second vertical polarization-dependent displacement crystal 4-1 to the optical path; adjust the second Three-state converter 9, respectively spherical Fourier transform lens 9-3, horizontal cylindrical Fourier transform lens 9-2 and vertical cylindrical Fourier transform lens 9-1 and vacant state add optical path, every time The CCD images collected by the CCD camera 10 are collected once; respectively, the CCD images collected by the CCD camera 10 are calculated four times to obtain the first photon polarization density of state array element;
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