scholarly journals Performance of microheaters for tunable on-chip interferometer

2021 ◽  
Vol 2086 (1) ◽  
pp. 012173
Author(s):  
I O Venediktov ◽  
M S Elezov ◽  
A I Prokhodtsov ◽  
V V Kovalyuk ◽  
P P An ◽  
...  
Keyword(s):  
Coherent States ◽  
Pulse Mode ◽  
Study Phase ◽  
Experimental Realization ◽  
Minimum Error ◽  
Phase Modulators ◽  
Practical Tool ◽  
On Chip ◽  
Displacement Based ◽  
Telecom Wavelength

Abstract Mach-Zehnder interferometer (MZI) is a valuable practical tool in many optical science areas. In particular, high-contrast MZI are required for experimental realization of displacement-based quantum receivers that can discriminate weak coherent states of light with the minimum error rate. In this work we study phase modulators of tunable on-chip interferometer on silicon nitride (Si3N4) platform for telecom wavelength (1550 nm) consisting of several MZI. Phase modulators on one of the arms of MZI consists of microheaters and waveguide. Microheaters heat waveguides changing its refractive index due to thermo-optical effect providing a phase shift. We measure the bandwidth of phase modulators and study their operation in pulse mode.

scholarly journals Unipolar magnetic field pulses as an advantageous tool for ultrafast operations in superconducting Josephson “atoms”

2019 ◽  
Vol 10 ◽  
pp. 1548-1558
Author(s):  
Daria V Popolitova ◽  
Nikolay V Klenov ◽  
Igor I Soloviev ◽  
Sergey V Bakurskiy ◽  
Olga V Tikhonova
Keyword(s):  
Magnetic Field ◽  
Theoretical Approach ◽  
Magnetization Reversal ◽  
Population Transfer ◽  
Experimental Realization ◽  
Quantum Operations ◽  
Picosecond Time Scale ◽  
On Chip ◽  
Qubit States ◽  
Full Quantum

A theoretical approach to the consistent full quantum description of the ultrafast population transfer and magnetization reversal in superconducting meta-atoms induced by picosecond unipolar pulses of a magnetic field is developed. A promising scheme based on the regime of stimulated Raman Λ-type transitions between qubit states via upper-lying levels is suggested in order to provide ultrafast quantum operations on the picosecond time scale. The experimental realization of a circuit-on-chip for the discussed ultrafast control is presented.

scholarly journals Spatiotemporal light control with frequency-gradient metasurfaces

Science ◽  
2019 ◽  
Vol 365 (6451) ◽  
pp. 374-377 ◽  
Author(s):  
Amr M. Shaltout ◽  
Konstantinos G. Lagoudakis ◽  
Jorik van de Groep ◽  
Soo Jin Kim ◽  
Jelena Vučković ◽  
...  
Keyword(s):  
Frequency Comb ◽  
Beam Steering ◽  
Three Dimensional ◽  
Optical Control ◽  
Steering Angle ◽  
Experimental Realization ◽  
Phase Gradient ◽  
Power Efficient ◽  
On Chip ◽  
Frequency Gradient

The capability of on-chip wavefront modulation has the potential to revolutionize many optical device technologies. However, the realization of power-efficient phase-gradient metasurfaces that offer full-phase modulation (0 to 2π) and high operation speeds remains elusive. We present an approach to continuously steer light that is based on creating a virtual frequency-gradient metasurface by combining a passive metasurface with an advanced frequency-comb source. Spatiotemporal redirection of light naturally occurs as optical phase-fronts reorient at a speed controlled by the frequency gradient across the virtual metasurface. An experimental realization of laser beam steering with a continuously changing steering angle is demonstrated with a single metasurface over an angle of 25° in just 8 picoseconds. This work can support integrated-on-chip solutions for spatiotemporal optical control, directly affecting emerging applications such as solid-state light detection and ranging (LIDAR), three-dimensional imaging, and augmented or virtual systems.

Experimental Realization of an On-Chip All-Optical Analogue to Electromagnetically Induced Transparency

2006 ◽  
Vol 96 (12) ◽  
Author(s):  
Qianfan Xu ◽  
Sunil Sandhu ◽  
Michelle L. Povinelli ◽  
Jagat Shakya ◽  
Shanhui Fan ◽  
...  
Keyword(s):  
Electromagnetically Induced Transparency ◽  
Experimental Realization ◽  
All Optical ◽  
On Chip ◽  
Induced Transparency

scholarly journals Towards CW modelocked laser on chip – a large mode area and NLI for stretched pulse mode locking

2020 ◽  
Vol 28 (15) ◽  
pp. 22562 ◽  
Author(s):  
Neetesh Singh ◽  
Erich Ippen ◽  
Franz X. Kärtner
Keyword(s):  
Mode Locking ◽  
Pulse Mode ◽  
Large Mode Area ◽  
On Chip ◽  
Mode Area

scholarly journals Improving Continuous Variable Quantum Secret Sharing with Weak Coherent States

2020 ◽  
Vol 10 (7) ◽  
pp. 2411
Author(s):  
Yijun Wang ◽  
Bing Jia ◽  
Yun Mao ◽  
Xuelin Wu ◽  
Ying Guo
Keyword(s):  
Secret Sharing ◽  
Coherent States ◽  
Security Analysis ◽  
Quantum Secret Sharing ◽  
Continuous Variable ◽  
Quantum Systems ◽  
Phase Modulators ◽  
Security Proof ◽  
Optical Modes ◽  
Threshold Schemes

Quantum secret sharing (QSS) can usually realize unconditional security with entanglement of quantum systems. While the usual security proof has been established in theoretics, how to defend against the tolerable channel loss in practices is still a challenge. The traditional ( t , n ) threshold schemes are equipped in situation where all participants have equal ability to handle the secret. Here we propose an improved ( t , n ) threshold continuous variable (CV) QSS scheme using weak coherent states transmitting in a chaining channel. In this scheme, one participant prepares for a Gaussian-modulated coherent state (GMCS) transmitted to other participants subsequently. The remaining participants insert independent GMCS prepared locally into the circulating optical modes. The dealer measures the phase and the amplitude quadratures by using double homodyne detectors, and distributes the secret to all participants respectively. Special t out of n participants could recover the original secret using the Lagrange interpolation and their encoded random numbers. Security analysis shows that it could satisfy the secret sharing constraint which requires the legal participants to recover message in a large group. This scheme is more robust against background noise due to the employment of double homodyne detection, which relies on standard apparatuses, such as amplitude and phase modulators, in favor of its potential practical implementations.

Plug-and-Play squeezing experiment on chip at telecom wavelength

2019 ◽  
Author(s):  
François Mondain ◽  
Tommaso Lunghi ◽  
Alessandro Zavatta ◽  
Elie Gouzien ◽  
Florent Doutre ◽  
...  
Keyword(s):  
Plug And Play ◽  
On Chip ◽  
Telecom Wavelength

A Heterogeneously Integrated III-V/Si Colliding Pulse Mode-locked Laser with On-chip Feedback

2018 ◽  
Author(s):  
Songtao Liu ◽  
Tin Komljenovic ◽  
Sudharsanan Srinivasan ◽  
Erik Norberg ◽  
Gregory Fish ◽  
...  
Keyword(s):  
Pulse Mode ◽  
Mode Locked Laser ◽  
On Chip
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