All-optical, broadband and low-noise phase gate implementation method

A low-noise, phase-based technology, applied in photonic quantum communication, electrical components, electromagnetic wave transmission systems, etc., can solve problems such as quantum noise enhancement and achieve the effect of noise suppression

Active Publication Date: 2020-04-21
TONGJI UNIV
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Problems solved by technology

Studies have shown that under the same system parameters, the CPM of the ARG system is nearly 10 times larger than that of the EIT system. Therefore, the ARG technology can realize the π phase change of the probe light without attenuation, but due to the quantum Noise is also enhanced

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  • All-optical, broadband and low-noise phase gate implementation method
  • All-optical, broadband and low-noise phase gate implementation method
  • All-optical, broadband and low-noise phase gate implementation method

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Embodiment 1

[0023] figure 1 Shown is a schematic diagram of the energy level structure of the coherently prepared four-level atomic system. Assuming that the atoms are coherently prepared in two low-energy states |1> and |3> at the initial moment, the particle populations account for 50% each. A beam of strong pump light Ω P Coupling the transition between |1>→|2>, the single-photon detuning is δ / 2π=-0.32GHz. Weak probe light Ω p Coupled transitions between |2>→|3> with a two-photon detuning of δ 2ph . At this time, due to the two-wave mixing effect, the coherently prepared four-level atomic system is in the superposition state of the EIT system and the ARG system, so it not only has the advantages of the traditional EIT system and the ARG system, but also can make up for the shortcomings of both. For example, the pure EIT system can effectively suppress the absorption of the probe light by the medium in a certain frequency range, but the nonlinearity is weak in this frequency range,...

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Abstract

The invention relates to an all-optical, broadband and low-noise phase gate implementation method. A coherently prepared four-energy-level atomic system interacts with a beam of strong pump light anda beam of weak probe light, so that the four-energy-level atomic system becomes a combined system of an electromagnetically induced transparency (EIT) system and an active Raman gain (ARG) system. Byutilizing the two-wave mixing effect, the absorption generated by the EIT system and the gain generated by the ARG system are mutually counteracted, so that the gain / absorption of the detection lightis close to zero in a very wide frequency domain, and meanwhile, the noise in the four-energy-level atomic system is remarkably inhibited; and on such basis, a beam of phase control light is added tochange the phase of the detection light by pi, so that an all-optical, broadband and low-noise phase gate is realized.

Description

technical field [0001] The invention relates to a method for realizing a phase gate, in particular to realizing an all-optical, broadband and low-noise phase gate in a coherently prepared four-level atomic system based on the two-wave mixing effect. Background technique [0002] The controllable gate operation plays a pivotal role in the development of quantum information technology, and the direct control of the detection light phase is a very important part of quantum information science. In the field of nonlinear optics, nonlinear phase changes are mainly induced by self-phase modulation (SPM) and cross-phase modulation (CPM), so people try to use SPM and CPM to achieve large phase changes in various systems, Thus, the phase gate operation is realized, but due to the limitations of various factors, the observed phase changes are very small. For example, in solid-state optical fiber systems, passive optical media such as optical fibers require a long propagation distance ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/2557H04B10/2543H04B10/70
CPCH04B10/2557H04B10/2543H04B10/70
Inventor 关佳朱成杰羊亚平
Owner TONGJI UNIV
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