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Protecting a superconducting logical qubit from bit-flip error

May 5, 2015 - 2:00pm
Leonardo DiCarlo
Delft University of Technology

The safeguarding of quantum data against arbitrary errors induced by decoherence and faulty hardware is an outstanding challenge for all quantum information platforms. Quantum error correction  requires a combination of quantum and classical capabilities: discretizing and signaling physical qubit errors through non-demolition quantum parity measurements, and tracking these errors with a classical controller that simultaneously advances computation. I present an  implementation of the textbook quantum repetition code protecting one logical qubit (a two-dimensional subspace in a three-qubit Hilbert space) from bit-flip error, realized on a circuit QED processor with twelve superconducting quantum elements controlled by room-temperature electronics.  The discussion of this processor’s performance and limitations motivates a survey of current efforts in QuTech targeting a scalable quantum architecture and scalable control electronics for protecting quantum data against arbitrary errors.

2115 Computer and Space Sciences
College Park, MD 20742