Realization of Single-Photon Frequency-Domain Qubit Channels Using Phase Modulators

• Main Authors: José Capmany, Carlos R. Fernandez-Pousa
• Format: Article
• Language: English
• Published: IEEE 2012-01-01
• Series: IEEE Photonics Journal
• Subjects: Quantum information; microwave photonics
• Online Access: https://ieeexplore.ieee.org/document/6336771/

In a recent paper, have developed a scheme for the stochastic implementation of arbitrary quantum operations on multimode single-photon qudit states by using reconfigurable linear-optic systems. Based on this idea, we explore the use of phase modulation for the realization of qubit channels in the frequency basis. Single-photon states belonging to two different frequency modes differing by the modulator's driving frequency represent the input dual-rail qubit states. The channel is implemented by a phase modulator followed by a fiber Bragg grating, taking advantage of the high degree of reconfigurability and microwave bandwidth shown by electrooptic modulation technology. The channels are realized by a combination of three techniques: 1) suitably designed driving waveforms, which are probabilistically addressed to the modulator; 2) the corresponding addressing probabilities; and 3) the grating transmittance at the values of the frequency basis. The proposed scheme results in nonoptimal success probabilities but is shown to allow for a compact implementation of the conventional qubit random unitary channels and the qubit amplitude-damping channel.