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Mechanical Squeezed-Fock Qubit: Towards Quantum Weak-Force Sensing.

Yi-Fan Qiao¹, Jun-Hong An², Peng-Bo Li¹

¹Xi'an Jiaotong University, Ministry of Education Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter, Shaanxi Province Key Laboratory of Quantum Information and Quantum Optoelectronic Devices, School of Physics, Xi'an 710049, China.

Physical Review Letters

|February 16, 2026

Summary

This summary is machine-generated.

Researchers developed a new mechanical qubit using squeezed-Fock states in nonlinear oscillators. This quantum phonon platform enhances qubit coherence and boosts quantum sensing sensitivity by tenfold.

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Area of Science:

Quantum physics
Nanotechnology
Quantum information science

Background:

Mechanical qubits offer long coherence times and sensing potential.
Weak nonlinearities and anharmonicity limit current nanomechanical resonators.

Purpose of the Study:

To overcome limitations of mechanical qubits by enhancing nonlinearity and anharmonicity.
To propose a novel mechanical qubit based on squeezed-Fock states.
To improve quantum sensing capabilities using mechanical systems.

Main Methods:

Utilizing squeezed-Fock states of phonons in a parametrically driven nonlinear mechanical oscillator.
Implementing two-phonon driving to create eigenstates.
Encoding a qubit in the ground and first excited squeezed-Fock states.

Main Results:

Achieved exponentially enhanced and tunable anharmonicity in the mechanical oscillator.
Demonstrated that squeezed-Fock states are eigenstates under two-phonon driving.
Showcased exponentially suppressed transitions to higher energy states.
Developed a mechanical squeezed-Fock qubit.

Conclusions:

The mechanical squeezed-Fock qubit offers enhanced coherence and tunable anharmonicity.
This platform significantly increases sensitivity for quantum sensing of weak forces (by at least one order of magnitude).
The proposed system provides a powerful quantum phonon platform for advanced quantum sensing and information processing.