All-Optical Ultrafast Arbitrary Rotation of Hole Orbital Qubits with Direct Phase Control

Area of Science:

• Quantum Information Science
• Solid-State Physics
• Quantum Optics

Background:

• Quantum control of stationary qubits is vital for photonic quantum technologies.
• Orbital degrees of freedom in quantum dots offer a promising qubit platform.
• Achieving arbitrary rotations on orbital qubits has been a significant challenge.

Purpose of the Study:

• To demonstrate arbitrary rotation of a hole orbital qubit.
• To achieve direct phase control of orbital qubits.
• To advance quantum information processing capabilities in solid-state systems.

Main Methods:

• Utilized picosecond optical pulses for qubit manipulation.
• Induced stimulated Raman transitions within Lambda (Λ) systems.
• Leveraged radiative Auger processes for qubit coupling.

Main Results:

• Demonstrated arbitrary rotation of a hole orbital qubit with direct phase control.
• Enabled direct control over polar and azimuth angles of the Bloch vector.
• Eliminated the need for timed precession for qubit control.

Conclusions:

• Established orbital states in solid-state quantum emitters as a viable resource.
• Paved the way for high-speed quantum information processing applications.
• Opened new avenues for controlling quantum states in quantum dots.