Gaussian Conversion Protocols for Cubic Phase State Generation

Universal quantum computing with continuous variables requires non-Gaussian resources, in addition to a Gaussian set of operations. A known resource enabling universal computation is the cubic phase state, state whose experimental implementation has so far remained elusive. In this paper, we introduce two conversion protocols that allow for been achieved experimentally, namely trisqueezed [Chang et al., Phys. Rev. X 10, 011011 (2020)], state. The first protocol deterministic and it involves active (inline) squeezing, achieving large fidelities saturate bound protocols. second probabilistic an auxiliary squeezed thus removing necessity inline squeezing but still maintaining significant success probabilities even larger than case. these provides strong evidence using states as resources computation.10 MoreReceived 9 July 2020Revised 4 January 2021Accepted 27 2021DOI:https://doi.org/10.1103/PRXQuantum.2.010327Published by American Physical Society under terms Creative Commons Attribution 4.0 International license. Further distribution work must maintain attribution author(s) published article's title, journal citation, DOI.Published SocietyPhysics Subject Headings (PhySH)Research AreasOptical information processingQuantum computationQuantum processing variablesQuantum engineeringSuperconducting opticsQuantum Information