A device that can rapidly adjust the optical interference of continuously variable entangled source signals

Abstract

A device capable of quickly adjusting continuous variable entanglement source signal light interference comprises a laser device, a first optical parameter cavity, a second optical parameter cavity, afirst beam splitting unit and a second beam splitting unit and also comprises a first auxiliary light unit, a second auxiliary light unit, a first dichroic mirror, a second dichroic mirror and a third dichroic mirror. By switching mode matching for adjusting output signal light beams in the optical parameter cavities into mode matching for adjusting pumping light beams, weak signal light interference adjustment uneasy to observe is converted into higher-light-intensity frequency doubling light interference adjustment, and the device has the advantages of being accurate, convenient and visualin adjustment and the like; a light path for interference adjustment completely utilizes the existing light path producing entanglement light in the device, and introduction of an additional new laserelement is not needed, so that the device is simple in structure and low in cost; the output signal light in the two optical parameter cavities are reshaped into parallel light by utilizing an auxiliary light path, so that signal light is more convenient to transmit and reshape in space.

Description

technical field [0001] The invention belongs to the field of optical technology, and relates to a device capable of rapidly adjusting the optical interference of continuous variable entanglement source signals. Background technique [0002] Squeezed state light field is a non-classical light field that compresses the quantum noise of a certain orthogonal component below the limit of classical shot noise. The sensitivity of wave signal detection; in addition, two beams of single-mode squeezed light or one beam of double-mode squeezed light can be used to generate entangled light fields, and then applied to the research of quantum computing, quantum information and quantum communication. Among them, the coupling of two single-mode signal lights in an optical beam splitter with a splitting ratio of 50 / 50 is an effective method to realize a high-quality entangled light field. Specifically, the signal light generated by two optical parametric cavities is combined in an optical T...

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Problems solved by technology

[0004] In practical applications, the interference adjustment process is very complicated and difficult. It is necessary to fix the spot size of one beam of fundamental frequency light first, and then adjust the lens group of the beam matching unit in the optical path of the other beam of fundamental frequency light to shape its transverse mode size so that it is in the second Exactly the same transverse mode size at the optical beam splitter

The difficulty lies in: first, in the adjustment process, not only need to constantly replace the lens to adjust the coincidence degree of the two beams of fundamental frequency light, the operation is time-consuming and laborious; second, although the focal length and position of the shaping lens can be adjusted, the transverse mode of the signal light can be adjusted size, and then use the probe or CCD to observe the coincidence of the two beams at multiple positions, but because the power of the signal light is extremely weak, it is difficult for the CCD and the probe to directly observe the spot size, so in the process of pattern matching, only by observing The change of interference efficiency is used to judge the effect of adjustment, which brings extremely high difficulty to the operation

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