17835511. MULTIMODE COUPLER TO CONTROL INTERACTION BETWEEN QUANTUM BITS simplified abstract (INTERNATIONAL BUSINESS MACHINES CORPORATION)

MULTIMODE COUPLER TO CONTROL INTERACTION BETWEEN QUANTUM BITS

Organization Name

INTERNATIONAL BUSINESS MACHINES CORPORATION

Inventor(s)

Aaron Finck of White Plains NY (US)

David C. Mckay of Ossining NY (US)

Jiri Stehlik of New York NY (US)

John Blair of Katonah NY (US)

MULTIMODE COUPLER TO CONTROL INTERACTION BETWEEN QUANTUM BITS - A simplified explanation of the abstract

This abstract first appeared for US patent application 17835511 titled 'MULTIMODE COUPLER TO CONTROL INTERACTION BETWEEN QUANTUM BITS

Simplified Explanation

The patent application describes a device that includes two superconducting quantum bits (qubits) and a multimode coupler circuit. The coupler circuit has two modes and can operate in two states based on a control signal.

• In the first state, the first qubit is connected to the first mode and the second qubit is connected to the second mode. This configuration prevents interaction between the two qubits.
• In the second state, both qubits are connected to both modes. This allows for an interaction between the qubits and enables an entanglement gate operation.

Potential applications of this technology:

• Quantum computing: The device can be used as a building block for quantum computers, where entanglement gates are crucial for performing complex calculations.
• Quantum communication: The entanglement gate operation can be utilized for secure quantum communication protocols, such as quantum key distribution.

Problems solved by this technology:

• Interaction suppression: The device provides a way to suppress interaction between qubits when not needed, which is important for maintaining the integrity of quantum information.
• Controlled interaction: The device allows for controlled interaction between qubits when desired, enabling entanglement gate operations.

Benefits of this technology:

• Scalability: The device can be easily integrated into larger quantum systems, allowing for the construction of more powerful quantum computers.
• Versatility: The ability to switch between different states of interaction provides flexibility in performing various quantum operations.
• Improved quantum communication: The entanglement gate operation enhances the capabilities of quantum communication protocols, leading to more secure and efficient communication.

Original Abstract Submitted

A device comprises first and second superconducting quantum bits, and a multimode coupler circuit coupled between the first and second superconducting quantum bits. The multimode coupler circuit comprises a first mode and a second mode, and is configured to operate in one of a first state and a second state, in response to a flux tuning control signal. In the first state, the first superconducting quantum bit is exchange coupled to the first mode, and the second superconducting quantum bit is exchange coupled to the second mode, to suppress interaction between the first and second superconducting quantum bits. In the second state, the first and second superconducting quantum bits are exchange coupled to both the first and second modes, to enable an interaction between the first and second superconducting quantum bits and perform an entanglement gate operation.