Phys.org February 2, 2024
To harness the potential of a quantum computer, quantum information must be protected against error by encoding it into a logical state that is suitable for quantum error correction. The Gottesman-Kitaev-Preskill (GKP) qubit is a promising candidate because the required multiqubit operations are readily available at optical frequency. An international team of researchers (Japan, Germany, Czech Republic, USA – University of Virginia) developed and verified a GKP state in propagating light at telecommunication wavelength. The generation was based on interference of cat states, followed by homodyne measurements. Their final states exhibited nonclassicality and non-Gaussianity, including the trident shape of faint instances of GKP states. According to the researchers improvements toward brighter, multipeaked GKP qubits will be the basis for quantum computation with light… read more.
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