Researchers from IBM Quantum and Université Paris-Saclay have developed a noise model to advance the understanding of error correction and mitigation in quantum computing. The model, which is numerically scalable to tens of qubits, was used to study the noisy evolution of multipartite entangled states in superconducting qubit devices. The team found that the dynamics of these states required accounting for coherent frequency shifts caused by stochastic charge-parity fluctuations. The model was tested on increasingly complex initial states with up to 12 coupled qubits, demonstrating good agreement between experiments and simulations.
A team of researchers from IBM Quantum, IBM Research in Israel, and the Institut de Physique Théorique in France have conducted a study on the noisy evolution of multipartite entangled states, focusing on superconducting qubit devices. The team, consisting of Liran Shirizly, Grégoire Misguich, and Haggai Landa, has developed a model to account for coherent frequency shifts caused by stochastic charge-parity fluctuations.
The researchers introduced an approach to model the charge-parity splitting using an extended Markovian environment. This approach is numerically scalable to tens of qubits, allowing for efficient simulation of the dissipative dynamics of large multi-qubit states. The team conducted experiments using Qiskit experiments on IBM Quantum superconducting transmon qubits accessible via the cloud. They characterized the 1Q and 2Q parameters relevant in the studied setup, along with state preparation and measurement.
Findings of the Study
The study focused on probing the continuous-time dynamics of increasingly larger and more complex initial states with up to 12 coupled qubits in a ring-graph state. The researchers found a good agreement between the experiments and simulations. They discovered that the underlying many-body dynamics generate decays and revivals of stabilizers, which are extensively used in the context of quantum error correction.
Mitigation of Two-Qubit Coherent Interactions
The team also demonstrated the mitigation of two-qubit coherent interactions, also known as crosstalk, using tailored dynamical decoupling sequences. This finding could be valuable in advancing the understanding of error correction and mitigation in quantum computing.
Implications for Quantum Computing and Noise
The noise model and numerical approach developed in this study can be valuable for advancing the understanding of error correction and mitigation in quantum computing. It also invites further investigations into the dynamics of these processes. The researchers’ work contributes to the ongoing efforts to harness the full power of quantum algorithms.
Research Summary
The research conducted by the team from IBM Quantum, IBM Research in Israel, and the Institut de Physique Théorique in France provides valuable insights into the dynamics of multipartite entangled states in superconducting qubit devices. Their findings contribute to the broader understanding of quantum computing and could potentially lead to advancements in error correction and mitigation techniques.
Dissipative Dynamics of Graph-State Stabilizers with Superconducting Qubits is a research article authored by Liran Shirizly, Grégoire Misguich, and H. Landa. The article was published in the Physical Review Letters on January 3, 2024. The research explores the complex dynamics of graph-state stabilizers in the context of superconducting qubits. The full article can be accessed through its DOI: 10.1103/physrevlett.132.010601. Physical Review Letters
