Observing Time-Dependent Energy Level Renormalisation in an Ultrastrongly Coupled Open System
- URL: http://arxiv.org/abs/2408.15928v1
- Date: Wed, 28 Aug 2024 16:40:55 GMT
- Title: Observing Time-Dependent Energy Level Renormalisation in an Ultrastrongly Coupled Open System
- Authors: Alessandra Colla, Florian Hasse, Deviprasath Palani, Tobias Schaetz, Heinz-Peter Breuer, Ulrich Warring,
- Abstract summary: We show how strong coupling and memory effects influence the energy levels of open quantum systems.
Measurements reveal a time-dependent shift in the system's energy levels of up to 15% of the bare system frequency.
Our findings provide direct evidence of dynamic energy level renormalisation in strongly coupled open quantum systems.
- Score: 37.69303106863453
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: Understanding how strong coupling and memory effects influence the energy levels of open quantum systems is a complex and challenging problem. Here, we show these effects by probing the transition frequency of an open two-level system within the Jaynes-Cummings model, experimentally realised using Ramsey interferometry in a single trapped 25Mg+ ion. Measurements of the system, coupled to a single-mode environment, reveal a time-dependent shift in the system's energy levels of up to 15% of the bare system frequency. This shift, accurately predicted using an open system ansatz of minimal dissipation, results purely from ultra-strong system-mode interactions and the buildup of correlations. Time-averaged measurements converge to the dispersive Lamb shift predictions and match dressed-state energies, indicating that this observed shift represents a generalised Lamb shift applicable across all coupling and detuning regimes. Our findings provide direct evidence of dynamic energy level renormalisation in strongly coupled open quantum systems, although the total system-environment Hamiltonian is static; this underscores the significance of memory effects in shaping the reduced system's energy landscape. These results offer more profound insights into Hamiltonian renormalisation, essential for strong-coupling quantum thermodynamics and advancements in all quantum platforms.
Related papers
- Anomalous transport in U(1)-symmetric quantum circuits [41.94295877935867]
Investigation of discrete-time transport in a generic U(1)-symmetric disordered model tuned across an array of different dynamical regimes.
We develop an aggregate quantity, a circular statistical moment, which is a simple function of the magnetization profile.
From this quantity we extract transport exponents, revealing behaviors across the phase diagram consistent with localized, diffusive, and - most interestingly for a disordered system - superdiffusive regimes.
arXiv Detail & Related papers (2024-11-21T17:56:26Z) - Effect of the readout efficiency of quantum measurement on the system entanglement [44.99833362998488]
We quantify the entanglement for a particle on a 1d quantum random walk under inefficient monitoring.
We find that the system's maximal mean entanglement at the measurement-induced quantum-to-classical crossover is in different ways by the measurement strength and inefficiency.
arXiv Detail & Related papers (2024-02-29T18:10:05Z) - Evolution of many-body systems under ancilla quantum measurements [58.720142291102135]
We study the concept of implementing quantum measurements by coupling a many-body lattice system to an ancillary degree of freedom.
We find evidence of a disentangling-entangling measurement-induced transition as was previously observed in more abstract models.
arXiv Detail & Related papers (2023-03-13T13:06:40Z) - Effective Hamiltonian theory of open quantum systems at strong coupling [0.0]
We present the reaction-coordinate polaron-transform (RCPT) framework for generating effective Hamiltonian models.
Examples in this work include canonical models for quantum thermalization, charge and energy transport at the nanoscale, performance bounds of quantum thermodynamical machines.
arXiv Detail & Related papers (2022-11-10T17:10:33Z) - Pure Dephasing of Light-Matter Systems in the Ultrastrong and
Deep-Strong Coupling Regimes [0.21108097398435333]
Pure dephasing originates from the non-dissipative information exchange between quantum systems and environments.
Here we investigate how pure dephasing of one of the components of a hybrid quantum system affects the dephasing rate of the system transitions.
arXiv Detail & Related papers (2022-05-11T08:57:15Z) - Accelerating the approach of dissipative quantum spin systems towards
stationarity through global spin rotations [0.0]
We consider open quantum systems governed by a time-independent Markovian Lindblad Master equation.
Such systems approach their stationary state on a timescale that is determined by the spectral gap of the generator of the Master equation dynamics.
We show that even far simpler transformations constructed by a global unitary spin rotation allow to exponentially speed up relaxation.
arXiv Detail & Related papers (2022-04-11T18:00:34Z) - Regimes of Cavity-QED under Incoherent Excitation: From Weak to Deep
Strong Coupling [0.0]
A two-level atom interacting with a quantized single-mode electromagnetic field is described by the quantum Rabi model (QRM)
Here, we study the photon flux emission rate of this system under the incoherent excitation of the two-level atom for any light-matter interaction strength.
arXiv Detail & Related papers (2021-12-16T14:36:54Z) - Sensing quantum chaos through the non-unitary geometric phase [62.997667081978825]
We propose a decoherent mechanism for sensing quantum chaos.
The chaotic nature of a many-body quantum system is sensed by studying the implications that the system produces in the long-time dynamics of a probe coupled to it.
arXiv Detail & Related papers (2021-04-13T17:24:08Z) - Exponentially accelerated approach to stationarity in Markovian open
quantum systems through the Mpemba effect [0.0]
We show that the relaxation dynamics of Markovian open quantum systems can be accelerated exponentially by devising an optimal unitary transformation.
This initial "rotation" is engineered in such a way that the state of the quantum system becomes to the slowest decaying dynamical mode.
We illustrate our idea by showing how to achieve an exponential speed-up in the convergence to stationarity in Dicke models.
arXiv Detail & Related papers (2021-03-08T19:02:31Z) - Quantum Zeno effect appears in stages [64.41511459132334]
In the quantum Zeno effect, quantum measurements can block the coherent oscillation of a two level system by freezing its state to one of the measurement eigenstates.
We show that the onset of the Zeno regime is marked by a $textitcascade of transitions$ in the system dynamics as the measurement strength is increased.
arXiv Detail & Related papers (2020-03-23T18:17:36Z)
This list is automatically generated from the titles and abstracts of the papers in this site.
This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.