On-demand Parity-Time symmetry in a lone oscillator through complex, synthetic gauge fields

Abstract

What is the fate of an oscillator when its inductance and capacitance are varied while its frequency is kept constant? Inspired by this question, we propose a protocol to implement parity-time (PT) symmetry in a lone oscillator. Different forms of constrained variations lead to static, periodic, or arbitrary balanced gain and loss profiles, that can be interpreted as purely imaginary gauge fields. With a state-of-the-art, dynamically tunable LC oscillator comprising synthetic circuit elements, we demonstrate static and Floquet PT breaking transitions, including those at vanishingly small gain and loss, by tracking the circuit energy. Concurrently, we derive and observe conserved quantities in this open, balanced gain-loss system, both in the static and Floquet cases. Lastly, by measuring the circuit energy, we unveil a giant dynamical asymmetry along exceptional point (EP) contours that emerge symmetrically from the Hermitian degeneracies at Floquet resonances. Distinct from material or parametric gain and loss mechanisms, our protocol enables on-demand parity-time symmetry in a minimal classical system -- a single oscillator -- and may be ported to other realizations including metamaterials and optomechanical systems.

8 pages, 4 figures

References in corpus (7)

• Observation of parity-time symmetry breaking in a single spin system
• Quantum jumps in the non-Hermitian dynamics of a superconducting qubit
• Non-Hermitian dynamics without dissipation in quantum systems
• PT spectroscopy of the Rabi problem
• Maximal quantum entanglement at exceptional points via unitary and thermal dynamics
• Observation of two PT transitions in an electric circuit with balanced gain and loss
• Conserved quantities, exceptional points, and antilinear symmetries in non-Hermitian systems

Cited by in corpus (8)

• Quantum tomography of a third-order exceptional point in a dissipative trapped ion
• Generating high-order exceptional points in coupled electronic oscillators using complex synthetic gauge fields
• Non-Hermiticity in quantum nonlinear optics through symplectic transformations
• Stability of time-periodic $\mathcal{P}\mathcal{T}$ and anti-$\mathcal{P}\mathcal{T}$-symmetric Hamiltonians with different periodicities
• $\mathcal{P}\mathcal{T}$-Symmetry breaking in quantum spin chains with exceptional non-Hermiticities
• Conserved quantities in non-Hermitian systems via vectorization method
• Floquet Non-Bloch Formalism for a Non-Hermitian Ladder: From Theoretical Framework to Topolectrical Circuits
• Experimental observation of phase transitions of a deformed Dicke model using a reconfigurable, bi-parametric electronic platform