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Superconducting artificial atoms coupled to 1D open space
Aleksei Dmitriev, PhD student LTS, 2017, Ischgl. PI: Prof. Oleg Astafiev
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Egham, UK: Nanotech group
London, UK: Quantum Detection group Dr. Vladimir Antonov Prof. Oleg Astafiev Dr. Rais Shaikhaidarov, Teresa Honigl-Decrinis Dr. Tobias Lidstrom
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` Laboratory of Artificial Quantum Systems
Moscow Institute of Physics and Technologies, Dolgoprudny, Moscow Region
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Laboratory of Superconducting Metamaterials
Prof. A. Ustinov Laboratory of Superconductivity Prof. V. Ryazanov
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Issues Why microwave quantum optics with artificial atoms?
Why qubit in free space, not in the resonator? Why does the qubit in free space live so short?
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Quantum optics Strong coupling is desired: photon travels from cavity to atom many times and stays alive Could be implemented in different systems AAs coupled with light stronger than natural ones: fine constant is made small by Nature: 1-100 µs
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Let’s try something else
Open Space Many bosonic modes… … or just a classical propagating field… … or quantum field but still propagating… No fixed frequency Flying photons Ultimate nonlinearity Multiplexed read-outc Absense of dispersive regime Light flights away fast Many modes of quantum noise No microwave single photon detectors (yet)! + -
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Atom in open space Qubit acts as point-like scatterer of resonant field Artificial atom Artificial atoms are strongly coupled Natural atoms – weakly coupled to EM waves (weak scattering) Strong scattering of propagating waves A series of very promising applications
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How to measure resonant scattering Drive RF
coplanar line 50 Ω In resonance qubit acts as a point-like scatterer of radiation: Reflected wave interferes constructively Transmitted wave - destructively Amplification And detection
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Transmission How about dynamics? T Power Transmission coef.
Strong coupling (99% of extinction) Strong nonlinear regime of light-atom interaction How about dynamics? O. Astafiev et al. Science (2010)
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Phase, rad
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Dynamics of coherent emission
Γ1 ≈ 5-15 MHz is restricted by quantum noise sensitivity Γ2 = Γ1/2 as follows from experiment. Emission Amplitude Inductive coupling (ask for details if needed) Trying to change design to obtain Γ1 ≈ 1 MHz Yes, but extinction is worse then Large non-radiative relaxation
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Asymmetric coupling 40 µm Сс = 0.3 fF, Ce = 3 fF
System acts as a quantum emitter – single photons on demand
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Measuring the emission
Emission power (dBm)
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Adding extra tones A. Yu. Dmitriev et al. JETP Lett (2017)
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Autler-Townes splitting
Ω ω12 probe drive, Ω Ω Ω ω01 drive, Ω probe ω01 ω12
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1 year 3 months ago: today:
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Thank you for the attention! Welcome to Russia!
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