Related Experiment Video
Updated: Jun 27, 2025
12:21
Stimulated Stokes and Antistokes Raman Scattering in Microspherical Whispering Gallery Mode Resonators
Published on: April 4, 2016
11.3K
Spectral kissing and its dynamical consequences in the squeeze-driven Kerr oscillator
Jorge Chávez-Carlos1, Talía L M Lezama2, Rodrigo G Cortiñas3
1Department of Physics, University of Connecticut, Storrs, CT 06269 USA.
NPJ Quantum Information
|April 26, 2024
Summary
Transmon qubits simulate excited state quantum phase transitions (ESQPTs). Spectral kissing in driven transmons signals ESQPT precursors, showing unique quantum dynamics like exponential growth in correlators.
Area of Science:
- Quantum physics
- Condensed matter physics
- Quantum information science
Background:
- Transmon qubits are key elements in quantum computing and information processing.
- Beyond qubits, transmons function as multilevel nonlinear oscillators with applications in fundamental physics.
- Quantum phase transitions (QPTs) typically describe ground state changes, but excited state QPTs (ESQPTs) generalize this to excited states.
Purpose of the Study:
- To explore transmon qubits as simulators for excited state quantum phase transitions (ESQPTs).
- To investigate the phenomenon of spectral kissing in driven superconducting circuits as a precursor to ESQPTs.
- To analyze the dynamical consequences and observable signatures of ESQPTs in transmon systems.
Main Methods:
- Utilizing driven SNAIL-transmon superconducting circuits as a physical platform.
- Analyzing the effective Hamiltonian of the transmon system to identify spectral kissing.
- Simulating and observing dynamical features such as out-of-time-ordered correlators (OTOCs) and survival probability evolution.
Main Results:
- Experimental observation of spectral kissing in a driven SNAIL-transmon, identified as an ESQPT precursor.
- Demonstration of dynamical consequences including exponential growth and periodic revivals of OTOCs.
- Observation of slow survival probability evolution indicative of localization, a signature of ESQPT.
Conclusions:
- Transmon qubits serve as viable simulators for studying ESQPTs and their unique quantum dynamics.
- Observed spectral kissing is a direct experimental signature preceding ESQPTs in superconducting circuits.
- The identified ESQPT signatures are experimentally accessible with current superconducting circuit technology and relevant to other quantum systems.
Related Concept Videos
01:28Standing Waves in a Cavity
914
A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:
914
01:30Oscillations In An LC Circuit
2.3K
An idealized LC circuit of zero resistance can oscillate without any source of emf by shifting the energy stored in the circuit between the electric and magnetic fields. In such an LC circuit, if the capacitor contains a charge q before the switch is closed, then all the energy of the circuit is initially stored in the electric field of the capacitor. This energy is given by
2.3K
01:07Damped Oscillations
5.7K
In the real world, oscillations seldom follow true simple harmonic motion. A system that continues its motion indefinitely without losing its amplitude is termed undamped. However, friction of some sort usually dampens the motion, so it fades away or needs more force to continue. For example, a guitar string stops oscillating a few seconds after being plucked. Similarly, one must continually push a swing to keep a child swinging on a playground.
Although friction and other non-conservative...
Although friction and other non-conservative...
5.7K
01:08IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations
1.0K
Identical bonds within a polyatomic group can stretch symmetrically (in-phase) or asymmetrically (out-of-phase). Similar to hydrogen bonding, these vibrations also influence the shape of the IR peak. Generally, asymmetric stretching frequencies are higher than symmetric stretching frequencies. For example, primary amines exhibit two distinct IR peaks between 3300–3500 cm−1 corresponding to the symmetric and asymmetric N-H stretching, while secondary amines exhibit a single...
1.0K
01:04Oscillations about an Equilibrium Position
5.4K
Stability is an important concept in oscillation. If an equilibrium point is stable, a slight disturbance of an object that is initially at the stable equilibrium point will cause the object to oscillate around that point. For an unstable equilibrium point, if the object is disturbed slightly, it will not return to the equilibrium point. There are three conditions for equilibrium points—stable, unstable, and half-stable. A half-stable equilibrium point is also unstable, but is named so...
5.4K
01:06Forced Oscillations
6.5K
When an oscillator is forced with a periodic driving force, the motion may seem chaotic. The motions of such oscillators are known as transients. After the transients die out, the oscillator reaches a steady state, where the motion is periodic, and the displacement is determined.
6.5K