DS10 - Défi de tous les savoirs

Quantum Information Processing with Spin Ensembles – QIPSE

Submission summary

Quantum computing, with tremendous computing power due to quantum parallelism, has the potential to revolutionize the information technology. Practical quantum computing requires precise initialization, storage, control, readout, and transfer of quantum states. Various candidate systems have promising features on some aspects; however, none of them meets all the requirements. A new trend in the research of this field is to hybridize different types of systems and to combine their advantages.

A particularly promising hybrid quantum system is superconducting resonators or qubits coupled to solid-state electron spin ensembles. The superconducting resonators/qubits have the advantages of easy control, initialization, readout, and remote transfer of quantum states but have relatively short quantum coherence time. Electron spins in solids (e.g., nitrogen-vacancy centers in diamond and bismuth donors in silicon) have long coherence times. Spin ensembles have thus been proposed as quantum memories for superconducting qubits.

However, great challenges still need to be overcome for implementing quantum information using hybrid systems of superconducting circuits and solid-state spins. The collective quantum states of spin ensembles are volatile to the inhomogeneity of external fields and to the many-body interaction. Still it is technically difficult to implement dynamical decoupling for protecting quantum coherence of the spin ensembles. Also, the theoretical study of the quantum dynamics of spin ensembles is by nature a challenging many-body problem.

This joint project will form a strong-strong union of an experimental team in France and a theoretical team in Hong Kong to solve the key physics problems in superconductor-spin hybrid systems for quantum
information processing. The experimental team is a leading group in constructing and controlling hybrid superconductor-spin systems. The theoretical team has made significant contributions to research of spin decoherence, coherence preservation, and spin bath dynamics. The "hybridization" of the expertise of the two teams makes an ideal synergy especially suitable for tackling the challenges.

We will team up to design, construct, and optimize hybrid superconductor-spin systems, with the ambitious goal of demonstrating the first operational quantum memory for superconducting qubits. We will study decoherence of collective modes in spin ensembles and implement quantum control to preserve coherence of collective spin states for multi-mode quantum memory. We will further develop schemes for quantum simulation of quantum many-body physics and ultrasensitive magnetometry.

This project is expected to lay the foundation of quantum computing using the superconductor-spin hybrid systems. It will also help consolidate the cultural and educational connections between France and Hong Kong.

Project coordination

Patrice BERTET (Commissariat à l'Energie Atomique et aux Energies Alternatives)

The author of this summary is the project coordinator, who is responsible for the content of this summary. The ANR declines any responsibility as for its contents.

Partner

CEA Commissariat à l'Energie Atomique et aux Energies Alternatives
CUHK The Chinese University of Hong-Kong

Help of the ANR 238,142 euros
Beginning and duration of the scientific project: February 2016 - 48 Months

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