Method for setting GHZ state generation chip based on quantum frequency comb
A frequency comb and quantum technology, applied in the fields of quantum information technology, optical quantum chips and nonlinear optics, can solve the problems of high consumption of space transmission resources, difficulty in preparing high-quality, occupying multiple space channels, etc., to achieve system compatibility, Scalable photon count, easy-to-achieve effects
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Embodiment 1
[0040] Example 1: Generation of four-photon polarization-encoded GHZ states. image 3 It is a schematic diagram of the frequency relationship between the pump light and the photon and the corresponding path in the three parameter conversion process when the target state is the four-photon GHZ state. Frequency w of the three pump lasers a 、w b 、w c respectively set at w -1 、w 1 and w -3 on, where the frequency is w a The pump laser of 1 undergoes a parametric conversion process in the upper path, and the other two pump lasers undergo a parametric conversion process in the lower path. The three sets of two-photon frequency combs centered on the frequency of the pump laser are respectively shown in the figure by arcs Indicates that, for example, the arc connecting -2 and 0 represents a photon with a frequency w -2 , another photon at w 0 two-photon state. After the upper and lower paths are combined by a two-dimensional grating, the path information is converted to the p...
Embodiment 2
[0041] Example 2: Generation of six-photon polarization-encoded GHZ states. Figure 4 It is a schematic diagram of the frequency relationship between the pump light and photons and the corresponding paths in the three parameter conversion processes when the target state is a six-photon GHZ state. Frequency w of the three pump lasers a 、w b 、w c respectively set at w -1 、w 1 and w -5 on, where the frequency is w a The pump laser undergoes a parametric conversion process in the upper path, and the other two pump lasers undergo a parametric conversion process in the lower path, resulting in three groups of two-photon frequency combs centered on the pump laser frequency. After the upper and lower paths are combined by a two-dimensional grating, the path information is converted to the polarization direction. At this time, the frequency w -6 、w -4 、w -2 、w 0 、w 2 、w 4 The quantum state in which each frequency mode has one and only one photon is the six-photon GHZ state...
Embodiment 3
[0042] Example 3: Generation of eight-photon polarization-encoded GHZ states. Figure 5 It is a schematic diagram of the frequency relationship between the pump light and photons and the corresponding paths in the three parameter conversion processes when the target state is an eight-photon GHZ state. Frequency w of the three pump lasers a 、w b 、w c respectively set at w -1 、w 1 and w -7 on, where the frequency is w a The pump laser undergoes a parametric conversion process in the upper path, and the other two pump lasers undergo a parametric conversion process in the lower path, resulting in three groups of two-photon frequency combs centered on the pump laser frequency. After the upper and lower paths are combined by a two-dimensional grating, the path information is converted to the polarization direction. At this time, the frequency w -8 、w -6 、w -4 、w -2 、w 0 、w 2 、w 4 、w 6 The quantum state in which each frequency mode has one and only one photon is an eig...
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