“Our goal is to significantly improve information processing by creating faster quantum
In the scientific journal Optics Express, the groupresearchers from Japan described the waveguide optical parametric amplifier (OPA) module they created for quantum experiments. Combining this device with a specially designed photon detector made it possible to generate a state that is a superposition of coherent states.
Compressed continuous wave light is used forgeneration of various quantum states required for calculations. To achieve the best computing performance, the squeezed light source must have very low light loss and include a wide range of frequencies.
“We want to increase the clock speed of opticalquantum computers that can reach terahertz frequencies,” the researchers note. “Higher clock speeds enable computational tasks to be completed faster and reduce delay lines in optical circuits. This makes quantum computers more compact and also makes it easier to develop and stabilize the entire system.”
They used non-linear optical crystalsto generate squeezed light, but conventional devices do not generate quantum light with the properties required for faster quantum computing. To overcome this problem, researchers at the University of Tokyo have developed an OPA based on a waveguide type device that achieves high efficiency by confining light to a narrow crystal.
Researchers are now exploring the possibilitycombining high-speed measurement techniques with a new waveguide OPA to get closer to its goal of building an ultrafast optical quantum computer.
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