Boosting the generation rate of squeezed single-photon states by generalized photon subtraction

Abstract

In optical quantum information processing with continuous variables, optical non-Gaussian quantum states are essential for universal and fault-tolerant quantum computation. Experimentally, their most typical generation method is photon subtraction (PS), where single-photon detection by an on/off detector probabilistically heralds the generation of squeezed single-photon states. In PS, however, trying to avoid unwanted multiphoton detection inevitably limits the generation rate, hindering the application of squeezed single-photon states. Here, we theoretically show that generalized photon subtraction (GPS), a simple extension of PS, can improve the generation rate while maintaining the quality of the generated states. Furthermore, we experimentally demonstrate the generation rate improvement for 2-dB- and 4-dB-squeezed single-photon states compared to PS, by more than one order of magnitude, particularly for the case of 2 dB. Our results will accelerate the application of squeezed single-photon states to more advanced quantum information protocols.

14 pages, 7 figures

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• Optimal sensing of photon addition and subtraction on nonclassical light
• Sequential and Programmable Squeezing Gates for Optical Non-Gaussian Input States
• Single-Photon-Subtracted-Squeezed-Vacuum-State Based Postselected Weak Measurement and its Applications
• Scalable Optical Quantum State Synthesizer with Dual-Mode Resonator Memory
• Simplified scheme for continuous-variable entanglement distillation: multicopy distillation of Gaussian entanglement without heralding Gaussian measurements
• Maximum heralding probabilities of nonclassical-state generation from a two-mode Gaussian state via photon-counting measurements