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Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)

Generation of pulsed squeezed light at telecommunication wavelength using a high efficiency PPLN optical waveguide

M. Yoshimura, T. Sugaya, Takuya Hirano, Kazuro Kikuchi, Kaori Sugiura, Sunao Kurimura, H. Nakajima

Published May 1, 2011• 0 citations
Publisher

Abstract

In the present work, we report the generation of pulsed squeezed light at 1550 nm by parametric amplification in a low-optical-loss high-efficiency PPLN-WG of length 51 mm developed by NIMS/Waseda. We observed -1.7 dB of squeezing and +6.5 dB of anti-squeezing when the pump pulse energy was only 3nJ (peak power was 0.5 W). The results indicate that the waveguide is capable of generating more than 6 dB squeezing by improving optical losses by shortening the WG length, anti-reflecting coating on WG surfaces, and temporal shaping of the local oscillator, and more that 10 dB squeezing may be possible by using the state of-the-art high efficiency photodiodes.

DOI
10.1109/cleoe.2011.5943407

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In the present work, we report the generation of pulsed squeezed light at 1550 nm by parametric amplification in a low-optical-loss high-efficiency PPLN-WG of length 51 mm developed by NIMS/Waseda. We observed -1.7 dB of squeezing and +6.5 dB of anti-squeezing when the pump pulse energy was only 3nJ (peak power was 0.5 W). The results indicate that the waveguide is capable of generating more than 6 dB squeezing by improving optical losses by shortening the WG length, anti-reflecting coating on WG surfaces, and temporal shaping of the local oscillator, and more that 10 dB squeezing may be possible by using the state of-the-art high efficiency photodiodes.
We present the generation of pulsed squeezed light at telecommunication wavelength of 1.535 µm via single-pass parametric amplification in a periodically poled MgO-doped lithium niobate waveguide using a novel collinear configuration. The quadrature-amplitude of squeezed light is measured in time domain. The classical parametric deamplification of -3.2 dB and quadrature squeezing of -1.5 dB are observed. The maximum classical parametric amplification of 19.3 dB is obtained at pump average power of 0.47 mW, taking advantage of the tight confinement in a waveguide and high peak power of the pulsed light.
We achieved continuous-wave 8.3-dB squeezed light generation using a terahertz-order-broadband waveguide optical parametric amplifier by improving a measurement setup from our previous work [T. Kashiwazaki et al., Appl. Phys. Lett. 119, 251104 (2021)], where a low-loss periodically poled lithium niobate (PPLN) waveguide had shown 6.3-dB squeezing at a 6 THz frequency. First, to improve efficiency of the squeezed light detection, we reduced effective optical loss to about 12% by removing extra optics and changing the detection method into a low-loss balanced homodyne measurement. Second, to minimize phase-locking fluctuation, we constructed a frequency-optimized phase-locking system by comprehending its frequency responses. Finally, we found optimal experimental parameters of a measurement frequency and a pump power from their dependences for the squeezing levels. The measurement frequency was decided as 11 MHz to maximize a clearance between shot and circuit noises. Furthermore, pump power was optimized as 660 mW to get higher squeezing level while suppressing anti-squeezed-noise contamination due to an imperfection of phase locking. Note that this over-8-dB squeezing is achieved without any loss-correction and circuit-noise correction. Moreover, it is shown that the squeezing level soon after our PPLN waveguide is estimated at over 10 dB, which is thought to be mainly restricted by the waveguide loss. This broadband highly squeezed light opens the possibility to realize fault-tolerant ultra-fast optical quantum computers.
We report generation of 10.1\pm0.2-dB squeezed light from a broadband periodically poled lithium niobate (PPLN) waveguide optical parametric amplifier (OPA). Based on our previous report where a similar PPLN waveguide shows 8.3-dB squeezing [T. Kashiwazaki et al., Appl. Phys. Lett. 122, 234003 (2023)], we reduce phase fluctuations and overall optical losses in the measurement system. In particular, we introduce a novel phase detection technique that does not require tapping a part of the squeezed light to get a phase locking signal. We use a phase-detection OPA seeded by a tapped probe and pump light before a squeezer OPA. This configuration breaks the conventional trade-off between generating a phase-locking signal with high-signal-to-noise ratio and suppressing degradation of squeezing level caused by optical tapping. With all these improvements, the phase fluctuation angle is reduced from 14 mrad to 9 mrad, and the total optical loss from 12\% to 8\%. Achieving more than 10 dB of squeezing by the broadband waveguide OPA is a significant step towards realization of fault-tolerant ultra-fast universal optical quantum computation.
We report on the generation of quadrature squeezed light at 1.535 microm via single-pass optical parametric amplification in a periodically poled MgO:LiNbO(3) waveguide, and detection with a temporally shaped local oscillator. Squeezing of -4.1 dB was directly measured using the shaped local oscillator. Classical parametric gain of the shaped pulse was also investigated; a deamplification gain of -12.1 dB was observed with the amplification gain of only +13.8 dB. We experimentally show that the use of shaped pulse as local oscillator in homodyne detection allows us efficient squeezing detection with near-unit mode-matching efficiency.