Bulletin of the American Physical Society
55th Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Monday–Friday, June 3–7, 2024; Fort Worth, Texas
Session B07: Advances in Formal Quantum Theory
10:45 AM–12:45 PM,
Tuesday, June 4, 2024
Room: 203A
Chair: Georgi Gary Rozenman, Massachusetts Institute of Technology
Abstract: B07.00010 : Photon-blockade breakdown as a first-order dissipative phase transition in zero dimension*
12:33 PM–12:45 PM
Presenter:
András Vukics
(HUN-REN Wigner Research Centre for Physics)
Authors:
Riya Sett
(Institute of Science and Technology (IST) Austria)
Peter Domokos
(HUN-REN Wigner Research Centre for Physics)
Johannes M Fink
(Institute of Science and Technology Austria)
András Vukics
(HUN-REN Wigner Research Centre for Physics)
For PBB, an abstract thermodynamic limit has been identified [1], where the coupling g between the subsystems goes to infinity without affecting the system size (hence the designation zero-dimensional), and this limit was studied in a finite-size scaling approach [2], with scaling exponents determined numerically. I discuss the microscopic mechanism and the fully quantum solution, and assess the connection with optical bistability via the neo- and semiclassical models.
I describe the experimental studies: PBB was first observed in a circuit QED system [3], and the thermodynamic limit could also be modeled on this platform with a bespoke device [4]. Even though the system remains microscopic, its behavior becomes increasingly macroscopic as a function of g/κ (κ – resonator linewidth). For the highest realized g/κ≈287, the system switches with a characteristic timescale as long as 6 s between a bright coherent state with approximately 104 intracavity photons and the vacuum state. This exceeds the microscopic timescales by 6 orders of magnitude.
The numerical modelling [5] of this latter set of experiments highlighted the role of the higher lying transmon levels and the phase noise.
*This work has received funding from the Austrian Science Fund (FWF) through BeyondC (F7105) and the European Union's Horizon 2020 research and innovation program under Grant Agreement No. 862644 (FETopen QUARTET). A.V. acknowledges support from the National Research, Development and Innovation Office of Hungary (NKFIH) within the Quantum Information National Laboratory of Hungary. The authors thank the MIBA workshop and the Institute of Science and Technology Austria nanofabrication facility for technical support. We are grateful to HUN-REN Cloud for providing us with suitable computational infrastructure for the simulations.
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