Quantum information processing with circuit quantum electrodynamics

By A. Blais, Jay M. Gambetta, Andreas Wallraff, David I. Schuster, Steven M. Girvin, Michel H. Devoret, Robert J. Schoelkopf. 2006

545 citations recorded by the source corpus.

We theoretically study single and two-qubit dynamics in the circuit QED architecture. We focus on the current experimental design [Wallraff et al., Nature (London) 431, 162 (2004); Schuster et al., Nature (London) 445, 515 (2007)] in which superconducting charge qubits are capacitively coupled to a single high-$Q$ superconducting coplanar resonator. In this system, logical gates are realized by driving the resonator with microwave fields. Advantages of this architecture are that it allows for multiqubit gates between non-nearest qubits and for the realization of gates in parallel, opening the possibility of fault-tolerant quantum computation with superconduting circuits. In this paper, we focus on one- and two-qubit gates that do not require moving away from the charge-degeneracy ``sweet spot.'' This is advantageous as it helps to increase the qubit dephasing time and does not require modification of the original circuit QED. However, these gates can, in some cases, be slower than those that do not use this constraint. Five types of two-qubit gates are discussed, these include gates based on virtual photons, real excitation of the resonator, and a gate based on the geometric phase. We also point out the importance of selection rules when working at the charge degeneracy point.

Subfields: Artificial Intelligence, Atomic and Molecular Physics, and Optics

View Paper: https://www.semanticscholar.org/paper/904cc06cfa183a6ea4dbb05cdcdc635ee4a03eb7

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Citations in the corpus

Demonstration of two-qubit algorithms with a superconducting quantum processor (2009, background): “Tuning Q R into resonance with Q L , point III, shows an avoided crossing resulting from a cavity-mediated, qubit-qubit transverse interaction 12,32 investigated previously 26 .”
Hybrid quantum circuits: Superconducting circuits interacting with other quantum systems (2012, background): “A SC circuit involving a CPW resonator and a charge qubit was theoretically proposed by Blais et al. (2004, 2007) and experimentally demonstrated by Wallraff et al. (2004), where a strong electric coupling between a single photon and a charge qubit was achieved.”
Microwave photonics with superconducting quantum circuits (2017, background): “Also, scalable quantum information processing architectures can also be extended from the transversecoupling [330, 331] to the longitudinal-coupling case [327].”
Quantum information processing and quantum optics with circuit quantum electrodynamics (2020, methodology): “This challenge can be met at the software level using ‘transversal’ gates 69 and more generally using error correction at intermediate steps of gates 70 .”
Tunable Coupling Scheme for Implementing High-Fidelity Two-Qubit Gates (2018, methodology): “The latter is sometimes called virtual exchange interaction [24], which can be approximated by the Schrieffer-Wolff transformation”