Scalable quantum memory in the ultrastrong coupling regime.

Area of Science:

• Quantum computing
• Quantum information science
• Superconducting circuits

Background:

• Circuit quantum electrodynamics (cQED) with superconducting artificial atoms coupled to resonators is a leading architecture for scalable quantum computing.
• Recent advancements enable operation in the ultrastrong coupling regime, where qubit-resonator interaction strength is a significant fraction of the resonator frequency.

Purpose of the Study:

• To propose and investigate a qubit-resonator system operating in the ultrastrong coupling regime as a quantum memory device.
• To study the storage and retrieval of quantum information within a Z2 parity-protected quantum memory.
• To explore the potential for realizing scalable quantum random-access memory (qRAM) based on this system.

Main Methods:

• Utilizing superconducting artificial atoms coupled to on-chip resonators in the ultrastrong coupling regime.
• Implementing experimentally feasible schemes for quantum information storage and retrieval.
• Leveraging Z2 parity protection for enhanced memory stability and performance.

Main Results:

• Demonstration of efficient quantum information storage and retrieval within the proposed quantum memory.
• Validation of the ultrastrong coupling regime's suitability for quantum memory applications.
• Experimental feasibility of the proposed qubit-resonator system.

Conclusions:

• The proposed qubit-resonator system in the ultrastrong coupling regime shows promise as a quantum memory.
• Fast storage and readout capabilities suggest potential for scalable quantum random-access memory.
• This work advances the development of robust quantum information processing architectures.