Vivek Maurya

Universal Hamiltonian control in a planar trimon circuit

  1. Vivek Maurya,
  2. Daria Kowsari,
  3. Kumar Saurav,
  4. S.A. Shanto,
  5. R. Vijay,
  6. Daniel A. Lidar,
  7. and Eli M. Levenson-Falk
Multimode circuits provide an avenue for flexible control of single and multi-qubit gates. In this work we implement a multimode circuit known as a trimon integrated in a planar geometry.
The trimon features three transmon-like modes with strong all-to-all ZZ coupling. We demonstrate high fidelity operations on the trimon, achieving flexible control of its rich state space. This includes qubit rotations conditioned on one or both other qubits, unconditional single-qubit rotations, and both excitation-conserving and double-excitation two-qubit entangling gates. Through multi-tone driving we are able to implement all 16 two-qubit Pauli operators in the two-qubit space. We further demonstrate using the trimon as a qudit with up to 8 states and higher coherence than typical transmon-based implementations. Our results show a compact, highly controllable device that can potentially replace transmons in standard superconducting processor architectures.
arxiv pdf

SQuADDS: A validated design database and simulation workflow for superconducting qubit design

  1. Sadman Shanto,
  2. Andre Kuo,
  3. Clark Miyamoto,
  4. Haimeng Zhang,
  5. Vivek Maurya,
  6. Evangelos Vlachos,
  7. Malida Hecht,
  8. Chung Wa Shum,
  9. and Eli Levenson-Falk
We present an open-source database of superconducting quantum device designs that may be used as the starting point for customized devices. Each design can be generated programmatically
using the open-source Qiskit Metal package, and simulated using finite-element electromagnetic solvers. We present a robust workflow for achieving high accuracy on design simulations. Many designs in the database are experimentally validated, showing excellent agreement between simulated and measured parameters. Our database includes a front-end interface that allows users to generate „best-guess“ designs based on desired circuit parameters. This project lowers the barrier to entry for research groups seeking to make a new class of devices by providing them a well-characterized starting point from which to refine their designs.
arxiv pdf