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Probing Sensitivity Near a Quantum Exceptional Point Using Waveguide Quantum Electrodynamics.

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¹Massachusetts Institute of Technology, Research Laboratory of Electronics, Cambridge, Massachusetts 02139, USA.

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Summary

This summary is machine-generated.

Researchers explored parity-time (PT) symmetric systems for quantum sensing. They found that exceptional points in these systems do not enhance sensitivity, limiting their use in precision quantum sensing applications.

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Area of Science:

Quantum physics
Open quantum systems
Superconducting circuits

Background:

Non-Hermitian Hamiltonians describe open quantum systems with complex eigenenergies.
Parity-time (PT) symmetric systems exhibit exceptional points where eigenvalues and eigenvectors merge.
Exceptional points are theoretically proposed for precision quantum sensing due to abrupt spectral responses.

Purpose of the Study:

To emulate a passive parity-time (PT) dimer using superconducting qubits.
To investigate the quantum dynamics and sensitivity of PT-symmetric systems near exceptional points.
To explore the potential of waveguide quantum electrodynamics for studying non-Hermitian dynamics.

Main Methods:

Emulation of a passive PT dimer using a two-mode non-Hermitian superconducting qubit system.
Introduction of loss by coupling a qubit to a continuum of photonic modes in an open waveguide.
Characterization of system dynamics and eigenenergies using pulsed and continuous-wave measurements.

Main Results:

Observed behavior consistent with an ideal passive PT dimer, with minor corrections from the tunable coupler.
Extracted complex eigenenergies and calculated sensitivity as a function of coupling strength.
Confirmed theoretical predictions of no sensitivity enhancement near the quantum exceptional point.

Conclusions:

Exceptional-point systems do not offer enhanced sensitivity for quantum sensing.
The study elucidates limitations of exceptional points in quantum sensing applications.
Waveguide quantum electrodynamics provides a versatile platform for exploring non-Hermitian quantum dynamics in superconducting circuits.