A kind of preparation device and preparation method of Werner state in any dimension
A preparation device and dimension technology, which is applied in the field of quantum information processing, can solve the problems such as the inability to realize Werner state preparation, and achieve the effect of saving experimental costs, easy realization, and realization of preparation
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Embodiment 1
[0081] A preparation device for a two-dimensional Werner state, such as figure 1 As shown, it includes laser, nonlinear optical crystal 1, first half-wave plate 2, first BS3, first attenuator 5, second attenuator 6, first PBS8, first mirror 10, second mirror 11 , 2nd PBS9, 2nd BS4, 2 BDs.
[0082] In this embodiment, the nonlinear optical crystal 1 is a BBO crystal.
[0083] The light output by the laser is respectively input to the A light path and the B light path through the nonlinear optical crystal 1;
[0084] In the B optical path, the first BD12 is sequentially arranged along the optical path to generate two optical branches;
[0085] In the optical path A, the first half-wave plate 2 and the first BS3 are sequentially arranged along the optical path, and the first BS3 divides the optical path into a reflection R optical path and a transmission T optical path,
[0086] A first attenuator 5, a second BS4 and a first BD12 are sequentially arranged in the transmission T...
Embodiment 2
[0095] A preparation device for a three-dimensional Werner state, such as figure 2 As shown, the difference from the preparation device of the two-dimensional Werner state provided in Example 1 is that the device includes 4 BDs, and 2 BDs are arranged on the transmission T light path and the B light path.
[0096] In the B optical path, the first BD12 and the second BD16 are sequentially arranged along the optical path, which are divided into 2 and 3 optical branches in turn, and a half-wave plate is arranged on each of the optical branches, that is, between the first BD12 and the second BD16. The third half-wave plate 14 and the fourth half-wave plate 15 are respectively arranged on the two optical branches of the second BD16; the fifth half-wave plate 17, the sixth half-wave plate 18 and the fourth half-wave plate 17 are successively arranged on the three optical branches output by the second BD16. Seven half-wave plates19.
[0097] In the transmission T optical path, the ...
Embodiment 3
[0102] A preparation device for a four-dimensional Werner state, such as image 3 As shown, the difference from the two-dimensional Werner state preparation device provided in Example 1 is that the device includes 6 BDs, and 3 BDs are arranged on both the transmission T light path and the B light path.
[0103] In the optical path B, the first BD12, the second BD16 and the third BD13 are sequentially arranged along the optical path and divided into 2, 3, and 4 optical branches in turn, and a half-wave plate is arranged on each of the optical branches, that is, the first BD12 and The third half-wave plate 14 and the fourth half-wave plate 15 are respectively arranged on the two optical branches between the second BD16, and the fifth half-wave plate 17 is respectively arranged on the three optical branches between the second BD16 and the third BD13. , the sixth half-wave plate 18 and the seventh half-wave plate 19; the eighth half-wave plate 20, the ninth half-wave plate 21, the...
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