Abstract
Squeezed light has evolved into a powerful tool for quantum technology, ranging from quantum enhanced sensing and quantum state engineering based on partial post-selection techniques. The pulsed generation of squeezed light is of particular interest, as it can provide accurate time stamp and physically defined temporal mode, which are highly preferred in complex communication networks and large-scale information processing. However, the multimode feature of pulsed squeezing in conventional single-pass configuration limits the purity of the output state, negatively impacting its application in quantum technology. In this Letter, we propose a new approach to generate pulsed squeezing with high temporal purity. Pulsed squeezing based on parametric down-conversion in photonic cavities is analyzed. We show that the effective mode number of the output squeezed light approaches unity. Such a high-purity squeezed light can be realized with broad parameters and low pump power, providing a robust approach to generate large-scale quantum resource.
Highlights
Non-Gaussian states are indispensable resources required by quantum information processing to demonstrate quantum advantage [1]
We demonstrate that the effective mode number at the output can approach unity, showing there is only one dominant spectral-temporal mode
Recent development of aluminum nitride [36,38,39,40], gallium arsenide [41], and lithium niobate [42,43,44] photonics has made it possible to demonstrate pulsed squeezing with the proposed method [45]
Summary
Non-Gaussian states are indispensable resources required by quantum information processing to demonstrate quantum advantage [1]. Partial detection of squeezed light is one of the most important optical approaches to generate non-Gaussian states [2,3,4,5,6]. One standard configuration to implement pulsed squeezing is the single-pass parametric down-conversion [21,22,23,24,25] This process intrinsically involves multiple modes in both space and time, which all have significant squeezing and energy [26]. While the complex shaping of local oscillators can be utilized to improve the measured squeezing level [29], it does not work well on non-Gaussian state generation through partial detection, which requires the separation of different modes.
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