Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

Bulletin of the American Physical Society

State tomography of a three-level superconducting quantum circuit

Stefan Filipp, R. Bianchetti, Maxime Boissonneault, Andreas J. Wallraff

Published Mar 19, 2010• 0 citations
OpenAlex

Related papers

Quantum state tomography of three-photon down conversion in a superconducting circuit

Isaac Quijandria Diaz, Ingrid Strandberg, Göran Johansson

Bulletin of the American Physical Society•Mar 9, 2018•0 citations

Generation of multi-qubit entanglement in a superconducting quantum circuit by parallelized parity measurements

Stefano Poletto, Diego Ristè, Meng-Zi Huang +4 more

ve qubit superconducting processor. Two-qubit Bell states and three-qubit GHZ-type states are generated by single and double two-qubit parity measurements on superposition states, respectively, and characterized by both witnessing and state tomography. The protocol for generation of GHZ-type states can be used as the encoding step in the three-qubit bit-ip quantum error correction code, and made deterministic by digital feedback control. We assess its performance by state tomography of the six encoded cardinal states, and compare to the traditional method of encoding by gates.

Bulletin of the American Physical Society•Mar 2, 2015•0 citations

Tracking Multi-State Quantum Jumps in a Superconducting Circuit

Neda Forouzani, Dian Tan, Mahdi Naghiloo +1 more

Bulletin of the American Physical Society•Mar 17, 2016•0 citations

Entopy-energy inequality for superconducting qutrit

Vladimir I. Man’ko, Liubov A. Markovich

We compare the entropy-energy inequality and the von Neumann entropic inequality for three level atom implemented on superconducting circuits with Josephson junction. The positivity of entropy and energy relations for the qutrit system are used for verification of state tomography of qudit systems. The results obtained are valid for generic quantum states (qudits) and are illustrated on the example of the temperature density matrix of the single qutrit state.

arXiv:1608.01821•Aug 5, 2016•1 citation

Experimental State Tomography using Superconducting Quantum Bits

Matthias Steffen, M. Ansmann, Radoslaw C. Bialczak +7 more

Bulletin of the American Physical Society•Mar 15, 2006•0 citations

Control and Tomography of a Three Level Superconducting Artificial Atom

R. Bianchetti, Stefan Filipp, Matthias Baur +6 more

A number of superconducting qubits, such as the transmon or the phase qubit, have an energy level structure with small anharmonicity. This allows for convenient access of higher excited states with similar frequencies. However, special care has to be taken to avoid unwanted higher-level populations when using short control pulses. Here we demonstrate the preparation of arbitrary three level superposition states using optimal control techniques in a transmon. Performing dispersive readout, we extract the populations of all three levels of the qutrit and study the coherence of its excited states. Finally we demonstrate full quantum state tomography of the prepared qutrit states and evaluate the fidelities of a set of states, finding on average 95%.

arXiv:1004.5504•Physical Review Letters•Nov 24, 2010•164 citations
ve qubit superconducting processor. Two-qubit Bell states and three-qubit GHZ-type states are generated by single and double two-qubit parity measurements on superposition states, respectively, and characterized by both witnessing and state tomography. The protocol for generation of GHZ-type states can be used as the encoding step in the three-qubit bit-ip quantum error correction code, and made deterministic by digital feedback control. We assess its performance by state tomography of the six encoded cardinal states, and compare to the traditional method of encoding by gates.
A number of superconducting qubits, such as the transmon or the phase qubit, have an energy level structure with small anharmonicity. This allows for convenient access of higher excited states with similar frequencies. However, special care has to be taken to avoid unwanted higher-level populations when using short control pulses. Here we demonstrate the preparation of arbitrary three level superposition states using optimal control techniques in a transmon. Performing dispersive readout, we extract the populations of all three levels of the qutrit and study the coherence of its excited states. Finally we demonstrate full quantum state tomography of the prepared qutrit states and evaluate the fidelities of a set of states, finding on average 95%.