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INDIAN INSTITUTE OF SCIENCE EDUCATION AND RESEARCH (IISER) PUNE
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An Autonomous Institution, Ministry of Human Resource Development, Govt. of India
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Seminars and Colloquia

Physics

A programmable superconducting quantum processor with three pairwise coupled qubits 
 
Mon, Sep 10, 2018,   04:20 PM at Seminar Hall 31, 2nd Floor, Main Building

Prof. R Vijayaraghavan
TIFR, Mumbai

Abstract :

Storing and processing information using quantum two level systems (qubits) promises tremendous speed-up for certain computational tasks like prime factorisation and searching an unsorted database. In addition, many problems in quantum mechanics can also be solved a lot more efficiently. Scientist and engineers all over the world are trying to build the hardware that can implement these quantum algorithms. In this talk, I will present one particular approach which uses superconducting electrical circuits operating at millikelvin temperatures to implement the quantum hardware. I will introduce a new three-qubit device, nicknamed “trimon” [1], which is based on a multi-mode superconducting circuit providing strong inter-qubit coupling. I will discuss the basic working principles of the device, the implementation of efficient multi-qubit gates and the capability of universal programmability [2]. Next, I will demonstrate the high-fidelity preparation of various two- and three-qubit entangled states and realization of a few quantum algorithms like Deutsch-Jozsa, Grover etc [3]. I will end by talking about the possibility of scaling to larger systems using the trimon as a building block and the challenges ahead.

 

[1] Roy et al., Phys. Rev. Applied 7, 054025 (May 2017
[2] Roy at al., arXiv:1711.01658 (Nov 2017)
[3] Roy et al., arXiv:1809.00668 (Sep 2018

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