Deterministic quantum teleportation with feed-forward in a solid state system.

Area of Science:

• Quantum Information Science
• Superconducting Circuits
• Quantum Computing

Background:

• Macroscopic quantum systems using superconducting circuits are key for quantum information science.
• Current systems allow basic logic gates, entangled states, and error correction.
• High-fidelity single-qubit readout is essential for feedback control.

Purpose of the Study:

• To realize full deterministic quantum teleportation with feed-forward in a chip-based superconducting circuit.
• To utilize advanced readout techniques and flexible digital electronics for precise control.
• To explore the potential of crossed quantum bus technology for complex circuit architectures.

Main Methods:

• Employed a set of two parametric amplifiers for joint and individual qubit single-shot readout.
• Integrated flexible real-time digital electronics for control.
• Utilized crossed quantum bus technology for planar circuit architecture with arbitrary connectivity.

Main Results:

• Achieved full deterministic quantum teleportation with feed-forward in a superconducting circuit.
• Demonstrated high-fidelity teleportation of quantum states between macroscopic systems (6 mm apart) at a rate of 10^4 s^-1.
• The process succeeded with near-unit probability for any input state.

Conclusions:

• The demonstrated quantum teleportation scheme is highly efficient and scalable.
• Superconducting waveguides offer low transmission loss, enabling longer-distance quantum communication.
• The feed-forward technique shows promise for quantum error correction applications.