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 […]