Continuous-wave 6-dB-squeezed light with 2.5-THz-bandwidth from single-mode PPLN waveguide
Terahertz (THz)-bandwidth continuous-wave (CW) squeezed light is essential for integrating quantum processors with time-domain multiplexing (TDM) by using optical delay line interferometers. Here, we utilize a single-pass optical parametric amplifier (OPA) based on a single-spatial-mode periodically...
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| Published in | APL photonics Vol. 5; no. 3; pp. 036104 - 036104-7 |
|---|---|
| Main Authors | , , , , , , , |
| Format | Journal Article |
| Language | English |
| Published |
AIP Publishing LLC
01.03.2020
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| Online Access | Get full text |
| ISSN | 2378-0967 2378-0967 |
| DOI | 10.1063/1.5142437 |
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| Abstract | Terahertz (THz)-bandwidth continuous-wave (CW) squeezed light is essential for
integrating quantum processors with time-domain multiplexing (TDM) by using optical delay
line interferometers. Here, we utilize a single-pass optical parametric amplifier (OPA)
based on a single-spatial-mode periodically poled ZnO:LiNbO3 waveguide, which
is directly bonded onto a LiTaO3 substrate. The single-pass OPA allows THz
bandwidth, and the absence of higher-order spatial modes in the single-spatial-mode
structure helps avoid degradation of squeezing. In addition, the directly bonded ZnO-doped
waveguide has durability for high-power pump and shows small photorefractive damage. Using
this waveguide, we observe CW 6.3-dB squeezing at 20-MHz sideband by balanced homodyne
detection. This is the first realization of CW squeezing with a single-pass OPA at a level
exceeding 4.5 dB, which is required for the generation of a two-dimensional cluster state.
Furthermore, the squeezed light shows 2.5-THz spectral bandwidth. The squeezed light will
lead to the development of a high-speed on-chip quantum processor using TDM with a
centimeter-order optical delay line. |
|---|---|
| AbstractList | Terahertz (THz)-bandwidth continuous-wave (CW) squeezed light is essential for integrating quantum processors with time-domain multiplexing (TDM) by using optical delay line interferometers. Here, we utilize a single-pass optical parametric amplifier (OPA) based on a single-spatial-mode periodically poled ZnO:LiNbO3 waveguide, which is directly bonded onto a LiTaO3 substrate. The single-pass OPA allows THz bandwidth, and the absence of higher-order spatial modes in the single-spatial-mode structure helps avoid degradation of squeezing. In addition, the directly bonded ZnO-doped waveguide has durability for high-power pump and shows small photorefractive damage. Using this waveguide, we observe CW 6.3-dB squeezing at 20-MHz sideband by balanced homodyne detection. This is the first realization of CW squeezing with a single-pass OPA at a level exceeding 4.5 dB, which is required for the generation of a two-dimensional cluster state. Furthermore, the squeezed light shows 2.5-THz spectral bandwidth. The squeezed light will lead to the development of a high-speed on-chip quantum processor using TDM with a centimeter-order optical delay line. Terahertz (THz)-bandwidth continuous-wave (CW) squeezed light is essential for integrating quantum processors with time-domain multiplexing (TDM) by using optical delay line interferometers. Here, we utilize a single-pass optical parametric amplifier (OPA) based on a single-spatial-mode periodically poled ZnO:LiNbO3 waveguide, which is directly bonded onto a LiTaO3 substrate. The single-pass OPA allows THz bandwidth, and the absence of higher-order spatial modes in the single-spatial-mode structure helps avoid degradation of squeezing. In addition, the directly bonded ZnO-doped waveguide has durability for high-power pump and shows small photorefractive damage. Using this waveguide, we observe CW 6.3-dB squeezing at 20-MHz sideband by balanced homodyne detection. This is the first realization of CW squeezing with a single-pass OPA at a level exceeding 4.5 dB, which is required for the generation of a two-dimensional cluster state. Furthermore, the squeezed light shows 2.5-THz spectral bandwidth. The squeezed light will lead to the development of a high-speed on-chip quantum processor using TDM with a centimeter-order optical delay line. |
| Author | Enbutsu, Koji Yamashima, Taichi Kazama, Takushi Takanashi, Naoto Umeki, Takeshi Furusawa, Akira Kasahara, Ryoichi Kashiwazaki, Takahiro |
| Author_xml | – sequence: 1 givenname: Takahiro surname: Kashiwazaki fullname: Kashiwazaki, Takahiro organization: NTT Device Technology Labs, NTT Corporation – sequence: 2 givenname: Naoto surname: Takanashi fullname: Takanashi, Naoto organization: Department of Applied Physics, School of Engineering, The University of Tokyo – sequence: 3 givenname: Taichi surname: Yamashima fullname: Yamashima, Taichi organization: Department of Applied Physics, School of Engineering, The University of Tokyo – sequence: 4 givenname: Takushi surname: Kazama fullname: Kazama, Takushi organization: NTT Device Technology Labs, NTT Corporation – sequence: 5 givenname: Koji surname: Enbutsu fullname: Enbutsu, Koji organization: NTT Device Technology Labs, NTT Corporation – sequence: 6 givenname: Ryoichi surname: Kasahara fullname: Kasahara, Ryoichi organization: NTT Device Technology Labs, NTT Corporation – sequence: 7 givenname: Takeshi surname: Umeki fullname: Umeki, Takeshi organization: NTT Device Technology Labs, NTT Corporation – sequence: 8 givenname: Akira surname: Furusawa fullname: Furusawa, Akira email: akiraf@ap.t.u-tokyo.ac.jp organization: Department of Applied Physics, School of Engineering, The University of Tokyo |
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| Snippet | Terahertz (THz)-bandwidth continuous-wave (CW) squeezed light is essential for
integrating quantum processors with time-domain multiplexing (TDM) by using... Terahertz (THz)-bandwidth continuous-wave (CW) squeezed light is essential for integrating quantum processors with time-domain multiplexing (TDM) by using... |
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| Title | Continuous-wave 6-dB-squeezed light with 2.5-THz-bandwidth from single-mode PPLN waveguide |
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