Quantum computation holds immense promise and has set-off a race for the realization of the first practical quantum computer. It is now known that the standard circuit-model of quantum computation can be implemented using ion-traps, nuclear-spin states (NMR), superconducting circuits and photonics. But the key challenge is to identify an implementation which is scalable and fault-tolerant at room temperature.
A neat, scalable and practical implementation of quantum computing processes in the photonic domain is through the use of optical frequency combs (OFCs). These frequency combs are mode-locked femtosecond lasers which are available commercially today. IITM has made a firm beginning by investing $250k in one such laser system. Photonic methods proposed here exploit this unique aspect of the phases of photons belonging to different cavity modes being locked inherently in such lasers.Key advantages of the photonic method
- Room-temperature implementation
- Immunity to environmental fluctuations 3. Scalability
Quantum cryptography exploiting entanglement, which India needs for a variety of important reasons ranging from security in finance to strategic needs. Success in this area is possible only when there is expertise in developing science and technology hand-in-hand. IIT Madras has a strong base of expertise across disciplines, from physics to electrical engineering and mathematics, with experienced faculty in appropriate areas. It is well known that the institute accords equal importan ce to both Science and Technology. Therefore, it is critical that these advantages are leveraged to find a reliable solution.Objectives
Establishing a state of the art and futuristic photonic (h-nu) quantum information (nu-QI) center:
- Implementing a first of its kind nu-QI center at IITM to Make for India
- Training the next-generation quantum technologists twithin 5 years of establishment
- Address immediate needs of quantum technologies in finance and defense.
Nu-QIC will involve the following contemporary and next-generation technologies:
- Implement octave-spanning optical frequency combs (OFCs) and entangled photon sources;
- Femtosecond fiber based lasers for (OFCs) in the near-IR and IR
- Development of indigenous fiber optic high-bandwidth cryptographic technology; and
- Associated technology of frequency standards for lasers in India.