Transmon qubits are one of the most promising candidates for building a universal quantum processor. They consist of two discrete elements: a nanoscale Josephson junction (JJ) and a coplanar capacitor. In conventional transmon designs, the plates of the shunt capacitor have to be very large to achieve low participation ratio of the lossy interfaces. To circumvent this issue, we propose to engineer the device so that the electric field distribution is confined to junction dielectric by merging the capacitor and JJ into a single superconductor/dielectric/superconductor trilayer structure such that the frequency, anharmonicity, and Ej/Ec parameters are in the transmon regime. We refer to this architecture a mergemon to distinguish it from conventional designs. We explore different low-loss dielectrics such that the trilayer itself would provide not only the nonlinear inductance but also most of the capacitance of the transmon qubit. By FEM based simulation, we design the mergemon qubit-readout resonator to be in the strong dispersive regime. We also verify that this design can be realized with standard optical lithography process. Finally, we also discuss possibility of leveraging the state-of-the-art molecular-beam epitaxy technology to enhance the coherence of the mergemon.
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Presenters
Sungoh Park
NIST Boulder / CU Boulder
National Institute of Standards and Technology Boulder
University of Colorado, Boulder
University of Colorado Boulder
Authors
Sungoh Park
NIST Boulder / CU Boulder
National Institute of Standards and Technology Boulder
University of Colorado, Boulder
University of Colorado Boulder
Ruichen Zhao
NIST Boulder / CU Boulder
National Institute of Standards and Technology Boulder
National Institute of Standard and Technology Boulder
National Institute of Standards and Technology - Boulder
Corey Rae McRae
NIST Boulder / CU Boulder
NIST
National Institute of Standard and Technology Boulder
National Institute of Standards and Technology Boulder
Junling Long
NIST Boulder / CU Boulder
National Institute of Standards and Technology Boulder
University of Colorado Boulder
Physics, CU Boulder
Physics, University of Colorado-Boulder
Tongyu Zhao
University of Colorado Boulder
Physics, CU Boulder
Russell Lake
National Institute of Standards and Technology Boulder
QCD Labs, QTF Center of Excellence, Department of Applied Physics, Aalto University
QCD Labs, QTF Centre of Excellence, Department of Applied Physics, Aalto University
Bluefors
Mustafa Bal
National Institute of Standards and Technology Boulder
National Institute of Standards and Technology
National Institute of Standard and Technology Boulder
National Institute of Standards and Technology - Boulder
Haozhi Wang
NIST Boulder / CU Boulder
National Institute of Standards and Technology Boulder
National Institute of Standard and Technology Boulder
David Pappas
NIST Boulder
National Institute of Standards and Technology Boulder
NIST
National Institute of Standards and Technology
National Institute of Standard and Technology Boulder
National Institute of Standards and Technology - Boulder
