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    logical qubit tagged posts

    A Physical Qubit with built-in Error Correction

    February 6, 2024, Categories  Physics

    The creation of a photonic “Schrödinger cat state” – in other words the quantum superposition of states of the laser pulse amplitude that can be distinguished on a macroscopic scale (white or black cat) – can only be achieved using the most advanced quantum optical techniques and has already been demonstrated to be possible. In the present experiment that is subject of the research paper, it proved to be feasible to extend this to three states (white, gray, and black cats). This light state thus approaches a logical quantum state in which errors can be, in principle, universally corrected. (ill./ ©: Peter van Loock)

    There has been significant progress in the field of quantum computing.

    Big global players, such as Google and IBM, are already offering cloud-based quantum com...

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    A Logical Magic State with Fidelity beyond Distillation Threshold realized on Superconducting Quantum Processor

    December 29, 2023, Categories  Physics, Technology/Electronics

    Experimental results of the prepared different logical states. (a) Logical state fidelity with post-selection in Bloch sphere. The fidelity of the preparation of different logical states is represented as a circle, which is divided into multiple annular sectors, each representing a point on the Bloch sphere, with the radial direction representing the polar angle θ and the tangential direction representing the azimuthal angle φ. The obtained average logical fidelity is 0.8983. (b) Logical measurement results of X ̂_L, Y ̂_L, Z ̂_L as a function of polar angle θ or azimuthal angle φ. The colored dashed curves are the result of fitting with trigonometric function.

    Quantum computers have the potential to outperform conventional computers on some tasks, including complex optimization...

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