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Front-line Researchers
 Masaya Notomi, Senior Distinguished Scientist, NTT Basic Research Laboratories
Toward the Ultimate in Optical Integration Technology
Abstract
Photonic crystal, which can function as a photonic insulator (something not found in nature), is expected to provide major breakthroughs in optical integration technology. Dr. Masaya Notomi, Senior Distinguished Scientist at NTT Basic Research Laboratories, is a driving force behind research that aims to achieve on-chip optical networks by applying the special properties of photonic crystal. We asked him about his research experiences and what led him to take up the challenges of photonics.
Feature Articles on Technical Solutions to Real-world Problems
- Simulation System for Estimating Hazardous Voltages Induced in Telecommunication Cables by Power Faults
Abstract
This article introduces a system for simulating hazardous voltages induced in telecommunication cables in the event of power faults in high-voltage power transmission systems. When the estimated induction voltages exceed human safety limits, mitigation measures such as shielding the cables and using insulation (including the replacement of metallic telecommunication cable by optical fiber) are required. However, to date most of the work of calculating and estimating induced voltages has depended on manual operations. The new simulation system greatly reduces most of the manual operations by using a personal computer and a telecommunication cable database.
- Fault Cases and Countermeasures for Field Assembly Connectors in Optical Access Facilities
Abstract
We have investigated faults with field assembly connectors that had been breaking down in optical access facilities. These faults were caused by fiber scratching, fracture of the mechanical splice part, incorrect fiber lengths, incorrect cleaving, incorrect joining, and so on. All these causes can be eliminated by countermeasures such as correct use of tools and proper procedures.
- Troubleshooting Tool for FLET”ĒS TV
Abstract
NTT EAST Technical Assistance & Support Center has developed a tool called the RF Checker for troubleshooting problems in the homes of FLET”ĒS TV customers (RF: radio frequency). It can be used to check video-signal levels and video quality using simple operations, which should make in-home troubleshooting much more efficient.
- Corrosion Diagnosis Equipment for Inspecting Suspension Cables
Abstract
NTT has developed equipment for diagnosing corrosion in aerial suspension cables as an inspection tool. Although suspension cables use corrosion-resistant strands of steel wire having high anti-corrosion properties, cables in coastal areas can still suffer from localized corrosion inside the nozzle section of a terminal box. This diagnostic equipment can analyze such hidden corrosion nondestructively.
Regular Articles: New Paradigm toward Realizing Quantum Computers
- Measurement-based Quantum Computation and the Fault-tolerant System
Abstract
Quantum computation provides us with a new form of information processing that surpasses current computer technology. In a new model of quantum computation, measurement-based quantum computation, the computation proceeds via simple measurements on previously prepared quantum entangled states. This model has attracted attention for its good potential for realizing quantum computers. This article reviews the basic concepts of measurement-based quantum computation and the elegant fault-tolerant system called topological one-way quantum computation.
- Reducing the Resources in Measurement-only Quantum Computation
Abstract
This article describes a recent result concerning the construction of a small set of projective measurements required for implementing universal quantum computation, that is, for implementing an arbitrary unitary operation. Projective measurements are used as the main resources for implementing an arbitrary unitary operation in the measurement-only quantum computation model in contrast to conventional models. Resource minimization is important not only for realizing a quantum computer based on the measurement-only quantum computation model, but also for understanding the computational power of projective measurements.
Regular Articles
- Speech Dereverberation Using Linear Prediction
Abstract
This article describes a method of reducing reverberation in an observed signal to mitigate problems experienced in speech communication systems, such as hands-free mobile telephones, videoconferencing systems, hearing aids, and voice-controlled robots. It focuses on dealing with the effect of late reverberations, which are known to be a major cause of the degradation of automatic speech recognition (ASR) performance and loss of speech intelligibility. Experimental results show that this method can provide substantial improvements in ASR performance and audible quality under severely reverberant conditions.
- Virtual Private Network Authentication System Featuring High Extensibility and Availability: AAA
Abstract
NTT Network Service Systems Laboratories has developed an authentication system, called AAA, that authenticates users when they try to access a virtual private network (VPN). It features both high extensibility, which is the ability to flexibly combine multiple authentication methods depending on how a given user uses a VPN service, and high availability, which is the ability to avoid service disruption even in the event of a serious disaster.
NTT around the World
- NTT Com Asia
Total ICT Solutions Strengthen Hong Kong as the ICT Hub in Asia
Abstract
As the keystone of Mainland China, Hong Kong is powered by NTT Com Asia”Ēs comprehensive ICT (information and communications technology) solutions, which are strengthening its position as the regional ICT hub. It also supports the staggering growth of business activities in the region. This article introduces the office in Hong Kong and various ICT solutions offered.
External Awards/Papers Published in Technical Journals and Conference Proceedings
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