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Microwave-based arbitrary CPHASE gates for transmon qubits.

George S Barron¹, F A Calderon-Vargas¹, Junling Long²

¹Department of Physics, Virginia Tech, Blacksburg, Virginia 24061, USA.

Physical Review. B

|March 12, 2025

Summary

This summary is machine-generated.

Researchers developed new microwave pulses for superconducting transmon qubits, enabling arbitrary CPHASE gates essential for quantum computing and simulations. These smooth pulses achieve high fidelity (0.999) with short gate times (100 ns).

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Area of Science:

Quantum computing
Quantum simulation
Superconducting qubits

Background:

Superconducting transmon qubits are crucial for advancing quantum computing and simulations.
Quantum chemistry algorithms require nonmaximally entangling, arbitrary CPHASE gates for step-wise evolution.

Purpose of the Study:

To design smooth, simple microwave pulses for arbitrary CPHASE gates on superconducting transmon qubits.
To enable continuous tuning of the phase for enhanced gate control.

Main Methods:

Utilizing an analytically solvable approach to design microwave pulses.
Employing local invariants of the SU(4) evolution operator to construct pulse protocols.

Main Results:

Achieved CPHASE gate fidelities exceeding 0.999.
Demonstrated gate operation times as low as 100 nanoseconds.
Developed a method for continuous phase tuning.

Conclusions:

The designed microwave pulses offer a robust and efficient method for implementing arbitrary CPHASE gates.
The approach facilitates high-fidelity quantum operations crucial for complex quantum algorithms.