Entangling quantum circuits by measurement and feedback

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Deterministic entanglement of superconducting qubits by parity measurement and feedback
D. Ristè, M. Dukalski, C. A. Watson, G. de Lange, M. J. Tiggelman, Ya. M. Blanter, K. W. Lehnert, R. N. Schouten, L. DiCarlo
Nature 502, 350 (2013).

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Take a look at this animation for an explanation of our research using Schrodinger’s famous cats!

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Image gallery


Artist’s impression of the two qubits inside the cavity, and of their entanglement by parity measurement. The measurement (white beam traversing the cavity) transforms the initial two-qubit superposition state (four colored beams) into an entangled state (two intertwined beams). Image credit: Tremani and TU Delft.

Picture of the sample, showing the opened copper microwave cavity with the chip containing the two superconducting qubits. Microwave pulses enter and leave the cavity via the two ports, visible at the top of the picture.


(left) Picture of the cryogenic part of the experimental setup, showing the various temperature stages of the dilution refrigerator. The cavity with the two qubits is located at the lowest stage of the fridge, which reaches 15 millidegrees above absolute zero. (right) Zoom-in of the lowest-temperature stage.