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Perfect Intrinsic Squeezing at the Superradiant Phase Transition Critical Point
Hayashida et al. (2023) | Scientific Reports | DOI: 10.1038/s41598-023-29202-x
Motoaki Bamba
bamba.motoaki.y13@kyoto-u.jp
Normal Superradiant
No coupling
Static
electromagnetic
field
Superradiant transition
Critical point
Coupling strength
Perfect squeezing at the critical point
Near the superradiant phase transition
critical point:
Reaching the Perfect Squeezing Limit with Photonic Phase Transition
Considering the Dicke model (atoms coupling with a
photonic field) and investigating squeezing in its ground state
Squeezed light: A quantum state, with one conjugate variable
(electric field, magnetic field, or their superposition) having
fluctuation below the quantum limit
• Usually realized in non-equilibrium conditions
Squeezing is easily broken by unexpected noise
• Also possible in equilibrium, for example, in the ground state
of photon-matter coupled system Noise-resilient
Such perfect squeezing under equilibrium at a finite coupling
strength can revolutionize quantum sensing and computing!
However, Perfect squeezing (vanishing of a quantum fluctuation) is only
predicted at the infinite coupling strength limit, which is unrealistic
Numerical
+
theoretical analyses
Ground state expressed as
a two-mode squeezed vacuum
Time
Standard quantum limit
Electric field
Electric field
Magnetic field
Coherent state
Time
Magnetic field
Electric field Electric field
Squeezed Anti-Squeezed
Squeezed state
Time
Standard quantum limit
Magnetic field
Electric field Electric field
Vacuum state
Electric field Electric field
R
o
tating
Time
Squeezed
Anti-Squeezed
Magnetic field
Squeezed vacuum state
R
o
tating
R
o
tating
R
o
tating
Is perfect squeezing under equilibrium possible for finite coupling strength?
Electric field Electric field
Time
Squeezed
Magnetic field
With coupling, the ground state is non-oscillating squeezed vacuum state
Time
Standard quantum limit
Magnetic field
Electric field Electric field
Without coupling, the ground state is the vacuum state

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Reaching the Perfect Squeezing Limit with Photonic Phase Transition

  • 1. Perfect Intrinsic Squeezing at the Superradiant Phase Transition Critical Point Hayashida et al. (2023) | Scientific Reports | DOI: 10.1038/s41598-023-29202-x Motoaki Bamba bamba.motoaki.y13@kyoto-u.jp Normal Superradiant No coupling Static electromagnetic field Superradiant transition Critical point Coupling strength Perfect squeezing at the critical point Near the superradiant phase transition critical point: Reaching the Perfect Squeezing Limit with Photonic Phase Transition Considering the Dicke model (atoms coupling with a photonic field) and investigating squeezing in its ground state Squeezed light: A quantum state, with one conjugate variable (electric field, magnetic field, or their superposition) having fluctuation below the quantum limit • Usually realized in non-equilibrium conditions Squeezing is easily broken by unexpected noise • Also possible in equilibrium, for example, in the ground state of photon-matter coupled system Noise-resilient Such perfect squeezing under equilibrium at a finite coupling strength can revolutionize quantum sensing and computing! However, Perfect squeezing (vanishing of a quantum fluctuation) is only predicted at the infinite coupling strength limit, which is unrealistic Numerical + theoretical analyses Ground state expressed as a two-mode squeezed vacuum Time Standard quantum limit Electric field Electric field Magnetic field Coherent state Time Magnetic field Electric field Electric field Squeezed Anti-Squeezed Squeezed state Time Standard quantum limit Magnetic field Electric field Electric field Vacuum state Electric field Electric field R o tating Time Squeezed Anti-Squeezed Magnetic field Squeezed vacuum state R o tating R o tating R o tating Is perfect squeezing under equilibrium possible for finite coupling strength? Electric field Electric field Time Squeezed Magnetic field With coupling, the ground state is non-oscillating squeezed vacuum state Time Standard quantum limit Magnetic field Electric field Electric field Without coupling, the ground state is the vacuum state