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Quantum Kibble-Zurek mechanism and critical dynamics on a programmable Rydberg simulator
Alexander Keesling1, Ahmed Omran1, Harry Levine1
1Department of Physics, Harvard University, Cambridge, MA, USA.
Nature
|April 3, 2019
Summary
Researchers used a Rydberg atom quantum simulator to study quantum phase transitions (QPTs). They verified the quantum Kibble-Zurek mechanism and measured critical exponents, advancing our understanding of quantum dynamics.
Area of Science:
- Quantum physics
- Condensed matter physics
- Quantum simulation
Background:
- Quantum phase transitions (QPTs) are transformations between states of matter driven by quantum fluctuations.
- Understanding real-time dynamics in isolated, non-equilibrium quantum systems is challenging.
- Classical phase transitions have been extensively studied, but quantum critical dynamics remain less understood.
Purpose of the Study:
- To investigate quantum critical dynamics in isolated quantum systems.
- To experimentally verify the quantum Kibble-Zurek mechanism (QKZM) for an Ising-type QPT.
- To measure critical exponents in chiral clock models and explore scaling universality.
Main Methods:
- Utilized a Rydberg atom quantum simulator with programmable interactions.
- Studied the growth of spatial correlations during QPTs.
- Applied the simulator to analyze dynamics in distinct QPTs.
Main Results:
- Experimentally verified the QKZM for an Ising-type QPT.
- Observed scaling universality and corrections beyond QKZM predictions.
- Measured critical exponents for chiral clock models.
Conclusions:
- Rydberg atom simulators enable precision studies of quantum critical phenomena.
- This approach provides new insights into exotic quantum systems.
- Opens avenues for simulating lattice gauge theories and quantum optimization.
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