Taking Control of Superconducting Qubits

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• Siddiqi, I (University of California, Berkeley)
• Tuesday 05 August 2014, 10:30-11:10
• Seminar Room 1, Newton Institute.

If you have a question about this talk, please contact Mustapha Amrani.

Quantum Control Engineering: Mathematical Principles and Applications

Electronic circuits which exhibit quantum mechanical phenomenasuperposition and entanglement, in particularpromise a new generation of computers capable of solving currently intractable problems, secure communication, precision metrology, detectors with unparalleled sensitivity, and an efficient route for synthesizing new materials. One of the fundamental challenges, however, in realizing quantum machines is to sustain coherence over a time interval practical for performing coherent operations or computation. Until now, boosting coherence has involved hardware development to minimize coupling to a dissipative environment which typically transforms a quantum superposition into a classical state. Recent advances in the development of robust quantum-noise-limited microwave amplifiers and quantum bits with lifetimes in excess of 100 microseconds have enabled the use of feedback to actively suppress decoherence. In particular, we have been able to tailor the dissipa tive environment, either via measurement or excitation pulses, to stabilize quantum superposition states and coherent oscillations as well as track the evolution of single and two qubit states.

This talk is part of the Isaac Newton Institute Seminar Series series.

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