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光场的聚束和反聚束效应反映了光子的时空关联性, 是判别量子统计经典性与非经典性的关键指标, 在量子信息处理和精密测量中发挥着重要作用. 本文基于多级联Hanbury Brown-Twiss单光子探测方案研究了压缩热态与压缩数态光场全时延高阶相干函数$ {g^{(n)}} $的超聚束与反聚束效应. 分析了不同压缩参数$ r $、平均光子数$ \alpha $和压缩光子数$ n $条件下, 压缩热态与压缩数态光场的高阶相干性, 结果表明压缩热态光场具有显著的超聚束效应, 最大超聚束值为$ {g^{({5})}} $= 2.24 × 1014; 而压缩数态光场呈明显的反聚束特性, 最小反聚束值为$ {g^{({5})}} $ = 9.39 × 10–6. 并考虑实验条件下背景噪声$\gamma $和探测效率$\eta $的影响, 在探测效率较低、背景噪声较大的情况下, 平均光子数$ \alpha $较小的压缩热态光场仍可保持良好的超聚束特性, 当平均光子数$ \alpha $ = 0.5时, 通过调控压缩度$ S $, 最大超聚束值为$ {g^{({4})}} $ = 42.60. 另外, 通过调控压缩数态光场的压缩光子数$ n $和压缩度$ S $, 可实现高阶相干函数从反聚束到超聚束效应的连续大范围变化, 且其高阶相干度对环境噪声与探测效率有较强的鲁棒性. 进而研究了压缩热态光场在全时延条件下, 尤其是在相干时间范围内的高阶相干函数的变化特性, 其高阶相干度$ {g^{(n)}} $显著高于经典热态光场. 上述研究结果表明, 压缩热态光场的高阶光子超聚束特性, 及压缩数态光场的高阶相干度大范围连续可调性, 有助于高效量子态的制备调控与高分辨量子成像.
The bunching and antibunching effects of light fields reflect the spatiotemporal correlation of photons and are key indicators for distinguishing classical and non-classical quantum statistics. They play a crucial role in quantum information processing and precise measurement. In this paper, we investigate the super-bunching and antibunching effects of the full-time-delay higher-order coherence function $ {g^{(n)}} $ for squeezed thermal states and squeezed number states based on a multi-cascaded Hanbury Brown–Twiss single-photon detection scheme. Under ideal conditions, the high-order coherence of squeezed thermal states and squeezed number states is analyzed by changing compression parameter $ r $, average photon number $ \alpha $, and squeezed photon number $ n $. The results indicate that when the compression parameter $ r $∈[0, 1], the squeezed thermal state exhibits a significant super-bunching effect, with super-bunching values of each order being $ {g^{({2})}} $ = 9.98 × 105, $ {g^{({3})}} $ = 8.98 × 106, $ {g^{({4})}} $ = 8.96 × 1012, $ {g^{({5})}} $ = 2.24 × 1014. The squeezed number state exhibits a continuous transition from antibunching to bunching behavior, with coherence degrees of different orders being $ {g^{({2})}} $∈[1.60 × 10–5, 1.09], $ {g^{({3})}} $∈[9.02 × 10–6, 1.16], $ {g^{({4})}} $∈[4.75 × 10–6, 1.22], and $ {g^{({5})}} $∈[9.39 × 10–6, 1.30]). Simultaneously, this study analyzes the high-order photon coherence of squeezed thermal states and squeezed number states under experimental conditions, with background noise $\gamma $ and detection efficiency $\eta $ taken into account. When detection efficiency is relatively low and background noise is substantial, the higher-order coherence of squeezed thermal states with smaller average photon number $ \alpha $ is disturbed by background noise, but still maintains good super-bunching characteristics. However, when the average photon number $ \alpha $ becomes large, which is limited by the dead time of single-photon detector, it is challenging to accurately obtain all the information about the squeezed number state light field, leading measurement results to deviate from the ideal values. When the average photon number is $ \alpha $ = 0.5, the super-bunching effects reach their maximum values of $ {g^{({2})}} $ = 2.149, $ {g^{({3})}} $ = 6.389和$ {g^{({4})}} $ = 23.228, corresponding to the squeezing degrees $ {S^{({2})}} $ = 5.47, $ {S^{(3)}} $ = 4.86 and = 4.43, respectively. Furthermore, by adjusting the number of squeezed photons $ n $ and the squeezing degree of the squeezed number state light field, $S$, a continuous and wide-ranging change of high-order coherence function can be achieved, transforming from anti-bunching effect to super-bunching effect. Additionally, under the conditions of high environmental noise and low detection efficiency, higher-order coherence exhibits greater sensitivity to variations in optical field parameters than lower-order coherence. Furthermore, squeezed number states with multi-photon characteristics are less susceptible to disturbances from background noise, demonstrating stronger robustness. In addition, the variation characteristics of the high-order photon coherence function of the squeezed thermal state light field under the full time-delay conditions are investigated. The full time-delay high-order coherence $ {g^{(n)}} $ of the squeezed thermal state light field near the coherence time range $ {\tau _{{\text{STS}}}} $ is significantly higher than that of the classical thermal state light field. Even when a significant time delay is introduced into one of the optical paths, partial synchronization among photons can still maintain a certain correlation strength. Although unsynchronized photons lead to an overall reduction in coherence, the coherence is still higher than the theoretical predictions for thermal states under identical conditions. Based on the theoretical framework established in this work, future experiments may focus on adjusting the pump power, intracavity loss, and crystal temperature of optical parametric amplifiers to jointly control the squeezing degree and mean photon number, enabling stable generation of squeezed thermal states in different parameter regimes. Additionally, the precise measurement of higher-order coherence can be achieved using cascaded HBT detection systems with multiple inputs and high temporal resolution. In summary, by considering environmental noise, detection efficiency, and time delay, and by adjusting the average photon number, the number of squeezed photons, and the squeezing parameters, this method can prepare super-bunched squeezed thermal states and squeezed number states, whose higher-order coherence can be continuously adjusted over a wide range, thereby facilitating efficient quantum state preparation and manipulation, as well as high-resolution quantum imaging. -
Keywords:
- high-order photon coherence /
- squeezed thermal state /
- squeezed number state /
- super-bunching effect
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图 1 压缩热态与压缩数态光场的高阶相干性探测原理图
Fig. 1. Principle diagram of high-order degree of coherence detection for squeezed thermal states and squeezed number state.
图 2 相位无关压缩热态高阶相干函数$ {g^{(n)}} $随光场平均光子数$ \alpha $和压缩参数$ r $变化的超聚束结果 (a) $ {g^{(2)}} $; (b) $ {g^{(3)}} $; (c) $ {g^{(4)}} $; (d) $ {g^{(5)}} $
Fig. 2. Super-bunching results of higher-order coherence function $ {g^{(n)}} $in phase-independent squeezed thermal state varying with mean photon number $ \alpha $and squeezing parameter $ r $: (a) $ {g^{(2)}} $; (b) $ {g^{(3)}} $; (c) $ {g^{(4)}} $; (d) $ {g^{(5)}} $.
图 3 相位无关压缩数态高阶相干函数$ {g^{(n)}} $随压缩光子数$ n $和压缩参数$ r $变化的结果 (a) $ {g^{(2)}} $; (b) $ {g^{(3)}} $; (c) $ {g^{(4)}} $; (d) $ {g^{(5)}} $
Fig. 3. Higher-order coherence function $ {g^{(n)}} $of phase-independent squeezed number state varying with photon number $ n $ before squeezing and squeezing parameter $ r $: (a) $ {g^{(2)}} $; (b) $ {g^{(3)}} $; (c) $ {g^{(4)}} $; (d) $ {g^{(5)}} $.
图 4 压缩参数$ r $ = 1, 探测效率与背景噪声分别为($\eta $ = 1, $\gamma $ = 0), ($\eta $ = 0.5, $\gamma $ = 0.01)和($\eta $ = 0.5, $\gamma $ = 0.1)的情况下, 压缩热态光场高阶相干函数$ {g^{(n)}} $随平均光子数$ \alpha $的变化结果 (a) $ {g^{(2)}} $; (b) $ {g^{(3)}} $; (c) $ {g^{(4)}} $
Fig. 4. Higher-order coherence function $ {g^{(n)}} $of squeezed thermal state varying with mean photon number $ \alpha $when squeezing parameter $ r $ = 1, under detection efficiency and background noise conditions of ($\eta $ = 1, $\gamma $ = 0), ($\eta $ = 0.5, $\gamma $ = 0.01), and ($\eta $ = 0.5, $\gamma $ = 0.1): (a) $ {g^{(2)}} $; (b) $ {g^{(3)}} $; (c) $ {g^{(4)}} $.
图 5 平均光子数$ \alpha $ = 0.5, 探测效率与背景噪声分别为($\eta $ = 1, $\gamma $ = 0), ($\eta $ = 0.5, $\gamma $ = 0.01)和($\eta $ = 0.5, $\gamma $ = 0.1)的情况下, 压缩热态光场高阶相干函数$ {g^{(n)}} $随压缩度$S$的变化结果 (a) $ {g^{(2)}} $; (b) $ {g^{(3)}} $; (c) $ {g^{(4)}} $
Fig. 5. Higher-order coherence function $ {g^{(n)}} $of squeezed thermal state varying with squeezing degree $S$when mean photon number $ \alpha $ = 0.5, under detection efficiency and background noise conditions of ($\eta $ = 1, $\gamma $ = 0), ($\eta $ = 0.5, $\gamma $ = 0.01), and ($\eta $ = 0.5, $\gamma $ = 0.1): (a) $ {g^{(2)}} $; (b) $ {g^{(3)}} $; (c) $ {g^{(4)}} $.
图 6 实验条件下($\eta $= 0.5, $\gamma $= 0.01)和理想条件下($\eta $= 1, $\gamma $= 0), 压缩参数 (a) $ r $= 0.01, (b) $ r $= 0.1和(c) $ r $= 1时, 压缩数态高阶相干函数$ {g^{(n)}} $随压缩前数态光子数$ n $变化的结果
Fig. 6. Higher-order coherence function $ {g^{(n)}} $of squeezed number state varying with photon number $ n $without squeezing under experimental conditions ($\eta $= 0.5, $\gamma $= 0.01) and ideal conditions ($\eta $= 1, $\gamma $= 0), with squeezing parameter (a) $ r $= 0.01, (b) $ r $= 0.1, and (c) $ r $= 1.
图 7 压缩参数$ r $= 0.1, 压缩光子数分别为 (a1)—(c1) $ n $ = 1, (a2)—(c2) $ n $= 5和(a3)—(c3) $ n $ = 15时, 压缩数态在不同背景噪声$\gamma $ = 0.01, 0.1, 0.2的情况下的高阶相干函数$ {g^{(n)}} $随探测效率$\eta $的变化结果
Fig. 7. Higher-order coherence function $ {g^{(n)}} $of squeezed number state varying with detection efficiency $\eta $at squeezing parameter $ r $ = 0.1, with squeezed photon number (a1)–(c1) $ n $ = 1, (a2)–(c2) $ n $ = 5, and (a3)–(c3) $ n $ = 15, under different background noises $\gamma $ = 0.01, 0.1, 0.2.
图 8 背景噪声$\gamma $ = 0.01, 压缩光子数$ n $ = 1时, 压缩数态在不同探测效率$\eta $ = 0.1, 0.5, 1情况下的高阶相干函数$ {g^{(n)}} $随压缩度$S$的变化结果 (a) $ {g^{(2)}} $; (b) $ {g^{(3)}} $; (c) $ {g^{(4)}} $
Fig. 8. Higher-order coherence function $ {g^{(n)}} $of squeezed number state varying with squeezing degree $S$at background noise $\gamma $ = 0.01 and squeezed photon number $ n $ = 1, under different detection efficiencies $\eta $ = 0.1, 0.5, 1: (a) $ {g^{(2)}} $; (b) $ {g^{(3)}} $; (c) $ {g^{(4)}} $.
图 9 平均光子数$ \alpha $ = 1, 压缩参数$ r $ = 0.2, 压缩热态光场全时延条件下的四阶相干性$ {g^{(4)}} $随延迟时间$ {t_3} $, $ {t_4} $的变化结果 (a) $ {t_1} $ = $ 0{\tau _{{\text{STS}}}} $; $ {t_2} $ = $ 0{\tau _{{\text{STS}}}} $; (b) $ {t_1} $ = $ 0{\tau _{{\text{STS}}}} $; $ {t_2} $ = $ 3{\tau _{{\text{STS}}}} $; (c) $ {t_1} $ = $ 0{\tau _{{\text{STS}}}} $; $ {t_2} $ = $ - 3{\tau _{{\text{STS}}}} $
Fig. 9. Fourth-order degree of coherence $ {g^{(4)}} $of squeezed thermal state varying with delay times $ {t_3} $, $ {t_4} $under full-delay conditions at mean photon number $ \alpha $ = 1 and squeezing parameter $ r $ = 0.2: (a) $ {t_1} $ = $ 0{\tau _{{\text{STS}}}} $;$ {t_2} $ = $ 0{\tau _{{\text{STS}}}} $; (b) $ {t_1} $ = $ 0{\tau _{{\text{STS}}}} $;$ {t_2} $ = $ 3{\tau _{{\text{STS}}}} $; (c) $ {t_1} $ = $ 0{\tau _{{\text{STS}}}} $; $ {t_2} $ = $ - 3{\tau _{{\text{STS}}}} $.
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