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Feature Articles: A New Era in Quantum Information Processing Technologies
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 The Arrival of a New Era in Quantum Information Processing Technologies
Abstract
Research on quantum information processing has progressed astoundingly in the past several years. Concepts totally different from before such as adiabatic computation, quantum measurements, and topological states have been introduced, expanding the possibility of applications. This article introduces recent developments in quantum information processing and discusses NTT’s research achievements as examples of the advances in this field.
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Quantum Neural Network for Solving Complex Combinatorial Optimization Problems
Abstract
Optimization of various social systems, including communication, traffic, and social networking systems, requires the solving of complex combinatorial optimization problems. In this article, we describe the recent progress achieved in developing a quantum neural network, a computer that finds solutions to combinatorial optimization problems using a network of degenerate optical parametric oscillators.
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Lossless Wavelength Conversion of Single Photons
Abstract
We demonstrated a new scheme for wavelength conversion of a single-photon wave packet for use in quantum information communication technologies. The scheme enables us to deterministically change the color and shape of a single-photon wave packet in a lossless manner. The scheme is directly applicable to single photons traveling in an optical fiber network and will be a key technology in developing a photonic wavelength interface for quantum networking.
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Demonstration of Realism Violation on a Macroscopic Scale
Abstract
In quantum mechanics, we can realize quantum superposition states, which cannot be understood by the usual common sense in our living world. In the microscopic world, such as that experienced by a single electron spin, superposition behavior has been experimentally confirmed. However, it is still controversial as to whether or not we can in principle observe such quantum phenomena in the macroscopic world. At NTT Basic Research Laboratories, we have experimentally tested such macroscopic quantum phenomena by using a macroscopic quantum device.
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Coherent Coupling between 4300 Superconducting Flux Qubits and a Microwave Resonator
Abstract
A superconducting flux qubit can be used as a magnetic field sensor, and this has potential applications in many fields such as medical science and biology. If we could realize an entanglement between the superconducting flux qubits, it is expected that such a device would show much better sensitivity than any existing magnetic field sensors. We introduce here our recent research along this direction.
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Creating New Two-dimensional Topological Insulators for Fault-tolerant Quantum Computing
Abstract
Two-dimensional topological insulators (2DTIs) pave the way to explore novel quasiparticles for fault-tolerant quantum computing and to create devices utilizing spin degree of freedom. However, host materials that realize 2DTIs have so far been limited to two systems. In this article, we propose a strained quantum well structure as a new 2DTI candidate and demonstrate that strain enhances the energy gap and leads to superior bulk insulation properties.
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Implementation Security of Quantum Key Distribution
Abstract
Quantum key distribution is the ultimate cryptography in that it is theoretically secure against any possible eavesdropping. This ultimate security is an attractive feature, and companies and organizations in several countries, including Japan, are working on the deployment of networks for quantum key distribution. However, further research is needed to achieve the ultimate practical security, rather than security in principle. In this article, we introduce our recent research activities toward achieving the ultimate practical security.
Regular Articles
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Heart Rate Measurement with Video Camera Based on Visible Light Communication
Abstract
We have developed a system based on optical camera communication and an encoding method that can transfer the heart rates (HRs) of multiple people with high precision. The system can potentially measure and transfer the HRs of hundreds of people with their positional information. The unique system is composed of HR sensor units and a conventional camera. It is presented here along with the novel event timing encoding method.
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Path Loss Model to Evaluate Interference for Small Cells between Different Floors
Abstract
NTT Access Network Service Systems Laboratories and NTT DOCOMO have been carrying out joint research and development (R&D) toward construction of the fifth-generation mobile communications system (5G). This article presents a path loss model developed as one of our R&D activities.
Global Standardization Activities
Short Reports
External Awards/Papers Published in Technical Journals and Conference Proceedings
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