标题： 适应性测量超短单光子的时间形状用于高维量子信息处理 显示英文标题

标题： Adaptively measuring the temporal shape of ultrashort single photons for higher-dimensional quantum information processing

摘要： 光子是电磁场特定时空模式的一个激发态。 因此，精确了解模式结构对于其处理和检测以及将通用量子光态应用于新技术至关重要。 在这里，我们展示了一种自适应方案，用于重建超短单光子脉冲的任意振幅和相位时频轮廓。 该方法结合了超快相干控制和量子光学领域的技术，将脆弱量子态的模式映射到强相干场的模式上。 此外，我们表明在多个时频模式中生成和检测量子态的可能性可以作为将量子比特（及高维量子比特）编码到单一、宽带、超短光子中的基础。 提供对更大希尔伯特空间的访问，此方案可能会提升当前量子信息协议的容量。 显示英文摘要

摘要： A photon is the single excitation of a particular spatiotemporal mode of the electromagnetic field. A precise knowledge of the mode structure is therefore essential for its processing and detection, as well as for applying generic quantum light states to novel technologies. Here we demonstrate an adaptive scheme for reconstructing the arbitrary amplitude and phase spectro-temporal profile of an ultrashort single-photon pulse. The method combines techniques from the fields of ultrafast coherent control and quantum optics to map the mode of a fragile quantum state onto that of an intense coherent field. In addition, we show that the possibility of generating and detecting quantum states in multiple spectro-temporal modes may serve as a basis for encoding qubits (and qudits) into single, broadband, ultrashort, photons. Providing access to a much larger Hilbert space, this scheme may boost the capacity of current quantum information protocols.