Abstract
We demonstrate high-speed and low-noise near-infrared single-photon detection by using a capacitance balancing circuit to achieve a high spike noise suppression for an InGaAs/InP avalanche photodiode. The single-photon detector could operate at a tunable gate repetition rate from 10 to 60 MHz. A peak detection efficiency of 34% has been achieved with a dark count rate of 9 × 10⁻³ per gate when the detection window was set to 1 ns. Additionally, quantum detector tomography has also been performed at 60 MHz of repetition rate and for the detection window of 1 ns, enabling to witness the quantum features of the detector with the help of a negative Wigner function. By varying the bias voltage of the detector, we further demonstrated a transition from the full-quantum to semi-classical regime.
Highlights
Near-infrared single-photon detectors play a significance role in a wide range of applications, such as quantum key distribution [1,2,3,4,5], laser ranging [6,7,8,9] and biological fluorescence imaging [10]
Single-photon detectors based on InGaAs/InP avalanche photodiodes (APDs) have already demonstrated a desirable performance for singlephoton-level sensing at high speed
Due to the ever-growing need for the high-speed infrared single-photon detection in different applications, especially in quantum optics such as quantum key distribution [1,2,3,4,5], quantum state engineering based on conditional measurement [16] and linear optical quantum computing [17], it is necessary to assess the complete features of quantum detectors [18]
Summary
Near-infrared single-photon detectors play a significance role in a wide range of applications, such as quantum key distribution [1,2,3,4,5], laser ranging [6,7,8,9] and biological fluorescence imaging [10]. Due to the ever-growing need for the high-speed infrared single-photon detection in different applications, especially in quantum optics such as quantum key distribution [1,2,3,4,5], quantum state engineering based on conditional measurement [16] and linear optical quantum computing [17], it is necessary to assess the complete features of quantum detectors [18]. The quantum measurement such as quantum state tomography has become an important tool for the realization of diverse applications which require non-. The understanding and the control of this dynamic process may be of crucial importance in mastering the quantum information processing and quantum state engineering [16]
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