Amazon Technologies, Inc.

Andrew Joseph Keller

Oskar Jon Painter

Patricio Arrangoiz Arriola

Christopher Chamberland

Kyungjoo Noh

Fernando Brandao

Connor Hann

Joseph Kramer Iverson

Harald Esko Jakob Putterman

Rassul Karabalin

Prasahnt Sivarajah

Thomas Scaffidi

Menyoung Lee

Matthew Matheny

Colm Andrew Ryan

Arne Grimsmo

Ashley James Milsted

Matthew Sullivan Hunt

Gregory Scott Maccabe

Hesam Moradinejad

Gregory Peairs

David John Perello

Nasser Alidoust

Systems and methods for implementing a quantum code using cat qubits as data qubits and transmon qubits as ancilla qubits is disclosed. In some embodiments, a three-level transmon is used and Chi-matching is performed to determine dispersive coupling coefficients between the cat qubits and first and second excited states of the transmon qubits, wherein the dispersive coupling coefficients are used to perform gates between the cat data qubits and the transmon ancilla qubits. The Chi-matching determines the dispersive coupling coefficients such that the cat qubits are rotated in a same manner while performing the gates regardless as to whether a given transmon ancilla qubit remains in a second excited state or has decayed to a first excited state.

Quantum codes implemented using cat data qubits and transmon ancilla qubits

A fabrication method and associated apparatus is disclosed where an electromechanical resonator made out of lithium niobate is fabricated on the same substrate as a Josephson Junction-based transmon qubit. The starting material may be a high resistivity silicon wafer with a thin layer of lithium niobate (LiNbO¬). The fabrication method may include removing lithium niobate selectively from the substrate to preserve the quality of the substrate. The selective removal maintains defect free qualities of the silicon surface, thus enabling the fabrication of high performance Josephson Junction-based transmon qubit on the surface.

Method for producing transmon qubit and lithium niobate resonator on the same substrate

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Andrew Joseph Keller