US 12,423,606 B1
Quantum codes implemented using cat data qubits and transmon ancilla qubits
Kyungjoo Noh, Pasadena, CA (US); Christopher Chamberland, Pasadena, CA (US); Harald Esko Jakob Putterman, Malibu, CA (US); Oskar Jon Painter, Sierra Madre, CA (US); Fernando Brandao, Pasadena, CA (US); Andrew Joseph Keller, San Francisco, CA (US); Patricio Arrangoiz Arriola, San Francisco, CA (US); Thomas Scaffidi, Kensington, CA (US); Menyoung Lee, Ithaca, NY (US); Matthew Matheny, Diamond Bar, CA (US); Colm Andrew Ryan, Arcadia, CA (US); Prasahnt Sivarajah, Pasadena, CA (US); Connor Hann, New Haven, CT (US); Arne Grimsmo, Pasadena, CA (US); Joseph Kramer Iverson, Pasadena, CA (US); and Ashley James Milsted, Pasadena, CA (US)
Assigned to Amazon Technologies, Inc., Seattle, WA (US)
Filed by Amazon Technologies, Inc., Seattle, WA (US)
Filed on Dec. 10, 2021, as Appl. No. 17/548,402.
Int. Cl. G06N 10/20 (2022.01); G06N 10/40 (2022.01); G06N 10/60 (2022.01)
CPC G06N 10/20 (2022.01) [G06N 10/40 (2022.01); G06N 10/60 (2022.01)] 20 Claims
OG exemplary drawing
 
1. A system, comprising:
a quantum device configured to:
redundantly store logical information in a code, wherein the code comprises:
data qubits that respectively store redundant instances of the logical information, wherein the data qubits are implemented using cat qubits; and
ancilla qubits used to extract error information from the data qubits, wherein the ancilla qubits are implemented using transmon qubits; and
set dispersive coupling coefficients such that respective ones of the cat qubits rotate in a same manner during a set of gates regardless as to whether a corresponding one of the transmon qubits remains in a second excited state (f) or has decayed to a first excited state (e).