Wide Bandwidth and High Quality Squeezed Light SourceNTT Device Technology Laboratories

We have been advancing our researches on the wide-bandwidth and high-quality squeezed light generation device and the optical quantum control on integrated optical chips for the embodiment of high-speed optical quantum computers. Squeezed light is a kind of non-classical light, in which the balance of quantum fluctuation based on the uncertainty principle is disordered (squeezed); this light is used for a variety of optical quantum technology. We, with the optical device technology NTT has been cultivating, have succeeded in generating the wide bandwidth squeezed light with the noise compression rate at the world best level. This achievement will make a great contribution to the increase of the clock frequency of optical quantum computers and to the integration of optical chips. In addition, the application to the other fields such as gravitational wave detection and quantum sensing is expected.

Optical quantum computers are seen promising as the quantum computers operable at room temperature. In recent years, it has been shown that an outstandingly large-scale universal quantum computer, surpassing any other technology, is feasible by generating quantum entanglement over the time domain with respect to continuously flying quantum bits (qubits). For the application of such optical quantum technology, the integration of all the optical components is required. For such integration, the squeezed light of a wide bandwidth and high quality is essential. This is because we can reduce the intervals of the flying qubits by using the light source of a wide bandwidth. However, to this day, it has been difficult to realize a squeezed light generating device that has both the wide bandwidth performance and high quality.

• Realizing the wide bandwidth performance at the level of THz by the single-pass amplification
• Realizing the high squeezing level for the continuous waves by the waveguide structure
• Realizing the generation of high-speed optical quantum bits and large-scale quantum entanglement
• Shortening and integrating the optical delay line interferometers required for time domain multiplexing

• The optical light source for optical quantum computation with continuous variables
• Suppressing the noise and enhancing the sensitivity for the interferometers to detect gravitational waves and so forth
• Application in the fields of sensing such as quantum radars

NTT Device Technology Laboratories - Materials and Devices Laboratory