Phys.org September 27, 2022
An international team of researchers (Sweden, Japan) has developed a technique to overcome to noise and interference in quantum systems. Their technique could create any of the previously demonstrated states and the cubic phase state. They used a sequence of interleaved selective number-dependent arbitrary phase (SNAP) gates and displacements. The state preparation was optimized in two steps – first they used a gradient-descent algorithm to optimize the parameters of the SNAP and displacement gates; then optimized the envelope of the pulses implementing the SNAP gates. The results showed that this way of creating highly nonclassical states in a harmonic oscillator was robust to fluctuations of the system parameters such as the qubit frequency and the dispersive shift. The breakthrough is an important step towards efficient error correction in quantum computers…read more. Open Access TECHNICAL ARTICLEÂ
Illustration of the aluminum resonator to the right. The blue and red patterns show quantum mechanical states… Credit: Yen Strandqvist, Chalmers University of Technology