Multiplexed Readout of Superconducting Qubits Using a 3D Re-entrant Cavity Filter

  1. Mustafa Bakr,
  2. Simone D. Fasciati,
  3. Shuxiang Cao,
  4. Giulio Campanaro,
  5. James Wills,
  6. Mohammed Alghadeer,
  7. Michele Piscitelli,
  8. Boris Shteynas,
  9. Vivek Chidambaram,
  10. and Peter J. Leek
Hardware efficient methods for high fidelity quantum state measurements are crucial for superconducting qubit experiments, as qubit numbers grow and feedback and state reset begin to

Complementing the transmon by integrating a geometric shunt inductor

  1. Simone D. Fasciati,
  2. Boris Shteynas,
  3. Giulio Campanaro,
  4. Mustafa Bakr,
  5. Shuxiang Cao,
  6. Vivek Chidambaram,
  7. James Wills,
  8. and Peter J. Leek
We realize a single-Josephson-junction transmon qubit shunted by a simple geometric inductor. We couple it capacitively to a conventional transmon and show that the ZZ interaction between

Encoding optimization for quantum machine learning demonstrated on a superconducting transmon qutrit

  1. Shuxiang Cao,
  2. Weixi Zhang,
  3. Jules Tilly,
  4. Abhishek Agarwal,
  5. Mustafa Bakr,
  6. Giulio Campanaro,
  7. Simone D. Fasciati,
  8. James Wills,
  9. Boris Shteynas,
  10. Vivek Chidambaram,
  11. Peter Leek,
  12. and Ivan Rungger
Qutrits, three-level quantum systems, have the advantage of potentially requiring fewer components than the typically used two-level qubits to construct equivalent quantum circuits.

Emulating two qubits with a four-level transmon qudit for variational quantum algorithms

  1. Shuxiang Cao,
  2. Mustafa Bakr,
  3. Giulio Campanaro,
  4. Simone D. Fasciati,
  5. James Wills,
  6. Deep Lall,
  7. Boris Shteynas,
  8. Vivek Chidambaram,
  9. Ivan Rungger,
  10. and Peter Leek
Using quantum systems with more than two levels, or qudits, can scale the computation space of quantum processors more efficiently than using qubits, which may offer an easier physical

Efficient qutrit gate-set tomography on a transmon

  1. Shuxiang Cao,
  2. Deep Lall,
  3. Mustafa Bakr,
  4. Giulio Campanaro,
  5. Simone Fasciati,
  6. James Wills,
  7. Vivek Chidambaram,
  8. Boris Shteynas,
  9. Ivan Rungger,
  10. and Peter Leek
Gate-set tomography enables the determination of the process matrix of a set of quantum logic gates, including measurement and state preparation errors. Here we propose an efficient

High Coherence in a Tileable 3D Integrated Superconducting Circuit Architecture

  1. Peter A. Spring,
  2. Shuxiang Cao,
  3. Takahiro Tsunoda,
  4. Giulio Campanaro,
  5. Simone D. Fasciati,
  6. James Wills,
  7. Vivek Chidambaram,
  8. Boris Shteynas,
  9. Mustafa Bakr,
  10. Paul Gow,
  11. Lewis Carpenter,
  12. James Gates,
  13. Brian Vlastakis,
  14. and Peter J. Leek
We report high qubit coherence as well as low crosstalk and single-qubit gate errors in a superconducting circuit architecture that promises to be tileable to 2D lattices of qubits.