Suppressing Decoherence in Quantum State Transfer with Unitary Operations

Area of Science:

• Quantum Information Science
• Quantum Computing

Background:

• Decoherence is a primary limitation in quantum information processing.
• Transmitting quantum states is crucial for quantum communication and computation.

Purpose of the Study:

• To investigate the use of quantum state-dependent pre- and post-processing unitary operations for decoherence protection.
• To enhance the fidelity of multi-qubit quantum states during transmission.

Main Methods:

• Applied theoretical proposals for state-dependent unitary operations.
• Conducted quantum emulation experiments with perfect protecting unitaries.
• Performed real experiments on a cloud-accessible quantum processor with noisy unitaries.

Main Results:

• Observed increased output quantum state fidelity in both simulated and real experiments.
• Demonstrated successful suppression of decoherence in distributing two-qubit states across remote qubits.

Conclusions:

• The developed approach effectively protects known quantum states against decoherence.
• This method is valuable for assessing quantum device capabilities in state transmission and distribution.