Realization of efficient quantum gates with a superconducting qubit-qutrit circuit

Area of Science:

• Quantum Computing
• Superconducting Circuits
• Quantum Information Science

Background:

• Building quantum computers requires precise control and environmental isolation to minimize decoherence.
• Efficient quantum gate operations are crucial for reducing control time and improving quantum state coherence.

Purpose of the Study:

• To propose a novel superconducting circuit for implementing a tunable system of a qutrit coupled to two qubits.
• To demonstrate the system's capability for efficient quantum information tasks.

Main Methods:

• A superconducting circuit design featuring a tunable system with one qutrit and two coupled qubits.
• Utilizing the circuit to perform quantum information tasks such as entanglement generation and conditional three-qubit gates.

Main Results:

• The proposed system efficiently generates entanglement between two qubits.
• The circuit successfully implements conditional three-qubit quantum gates, including Toffoli and Fredkin gates.
• A conditional geometric gate suitable for holonomic quantum computing was realized.

Conclusions:

• The superconducting circuit offers an efficient and robust platform for quantum information processing.
• This system serves as a promising building block for scalable quantum networks and advanced quantum computation.