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Quantum Optomechanical Cavity
Shabir BarzanjehInstitute of science and technology(IST) Austria
IPM-Tehran (29.12.2016) 1
Presentation outline
Mechanical resonatorsRadiation pressureOptomechanical cavityMicrowave cavity and electromechanicsTheory of the Optomechanical cavity/cooling
2
Presentation outline
Mechanical resonatorsRadiation pressureOptomechanical cavityMicrowave cavity and electromechanicsTheory of the Optomechanical cavity/cooling
3
Mechanical resonatorsVibrational modes of any object is given by Euler beam theory
Rev. Mod. Phys. 86, 1391(2014) 4
Mechanical resonatorsVibrational modes of any object is given by Euler beam theory
damping external forces
Rev. Mod. Phys. 86, 1391(2014) 5
Mechanical resonatorsVibrational modes of any object is given by Euler beam theory
damping external forces
Rev. Mod. Phys. 86, 1391(2014) 6
Mechanical resonatorsVibrational modes of any object is given by Euler beam theory
damping external forces
the spread of the coordinate in the ground-state
mechanical vacuum state
Rev. Mod. Phys. 86, 1391(2014) 7
Mechanical resonatorsVibrational modes of any object is given by Euler beam theory
damping external forces
the spread of the coordinate in the ground-state
mechanical vacuum state
Rev. Mod. Phys. 86, 1391(2014) 8
ttttiional modes of any object is given by Euler beam theory
damping external
average phonon number of the environment
Effect of dissipation
Rev. Mod. Phys. 86, 1391(2014) 9
average phonon number of the environment
Rate of heating out from ground state
Effect of dissipation
Rev. Mod. Phys. 86, 1391(2014) 10Cold particle in the box
average phonon number of the environment
Rate of heating out from ground state
Effect of dissipation
Rev. Mod. Phys. 86, 1391(2014) 11
average phonon number of the environment
Rate of heating out from ground state
Effect of dissipation
Rev. Mod. Phys. 86, 1391(2014)
average phooooooooooooooooooooooooooooo
• Viscous damping• Clamping losses
• Thermoelastic damping and phonon-phonon interactions
• Materials-induced losses
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average phonon number of the environment
Rate of heating out from ground state
Effect of dissipation
Rev. Mod. Phys. 86, 1391(2014)
average phooooooooooooooooooooooooooooo
• Viscous damping• Clamping losses
• Thermoelastic damping and phonon-phonon interactions
• Materials-induced losses
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Cryogenic temperature ~7mk
ent
Noise spectrum of a damped mechanical resonator
One measures the motion of a single harmonic oscillator in thermal equilibrium, one will observe a trajectory x(t) oscillating at the eigenfrequencyΩm.
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Noise spectrum of a damped mechanical resonator
One measures the motion of a single harmonic oscillator in thermal equilibrium, one will observe a trajectory x(t) oscillating at the eigenfrequencyΩm.
Mechanical damping and the fluctuating thermal Langevin force lead to:
A randomly time-varying amplitude and phase
Amplitude and phase change on the time scale
15
Noise spectrum of a damped mechanical resonator
One measures the motion of a single harmonic oscillator in thermal equilibrium, one will observe a trajectory x(t) oscillating at the eigenfrequencyΩm.
Mechanical damping and the fluctuating thermal Langevin force lead to
A randomly time-varying amplitude and phase
Amplitude and phase change on the time scale
Europhys. Lett. 47, 545(1999)
16
Noise spectrum of a damped mechanical resonator
One measures the motion of a single harmonic oscillator in thermal equilibrium, one will observe a trajectory x(t) oscillating at the eigenfrequencyΩm.
Mechanical damping and the fluctuating thermal Langevin force lead to
A randomly time-varying amplitude and phase
Amplitude and phase change on the time scale
Europhys. Lett. 47, 545(1999)
noise power spectral density
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Quantum regime
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Why mechanical resonators? applications
Bridges different systems with different charactristics [Phys. Scr. T 137 014001(2009)]:a. Coupling with several qubits: atom, ion, and molecule
b. Coupling with BECs
c. Superconducting qubits(transmon)
Quantum information processing [Phys. Rev. Lett. 110, 120503(2013)]
Optical-microwave conversion [ShB, Phys. Rev. Lett. 109, 130503 (2012)]
Strong Nonlinearity [Phys. Rev. B 67 134302 (2003)]
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Why mechanical resonators? applications
Bridges different systems with different charactristics [Phys. Scr. T 137 014001(2009)]:a. Coupling with several qubits: atom, ion, and molecule
b. Coupling with BECs
c. Superconducting qubits(transmon)
Quantum information processing [Phys. Rev. Lett. 110, 120503(2013)]
Optical-microwave conversion [ShB, Phys. Rev. Lett. 109, 130503 (2012)]
Strong Nonlinearity [Phys. Rev. B 67 134302 (2003)]
20
Why mechanical resonators? applications
Bridges different systems with different charactristics [Phys. Scr. T 137 014001(2009)]:a. Coupling with several qubits: atom, ion, and molecule
b. Coupling with BECs
c. Superconducting qubits(transmon)
Quantum information processing [Phys. Rev. Lett. 110, 120503(2013)]
Optical-microwave conversion [ShB, Phys. Rev. Lett. 109, 130503 (2012)]
Strong Nonlinearity [Phys. Rev. B 67 134302 (2003)]
21
Why mechanical resonators? applications
Bridges different systems with different charactristics [Phys. Scr. T 137 014001(2009)]:a. Coupling with several qubits: atom, ion, and molecule
b. Coupling with BECs
c. Superconducting qubits(transmon)
Quantum information processing [Phys. Rev. Lett. 110, 120503(2013)]
Optical-microwave conversion [ShB, Phys. Rev. Lett. 109, 130503 (2012)]
Strong Nonlinearity [Phys. Rev. B 67 134302 (2003)]
22
Why mechanical resonators? applications
Bridges different systems with different charactristics [Phys. Scr. T 137 014001(2009)]:a. Coupling with several qubits: atom, ion, and molecule
b. Coupling with BECs
c. Superconducting qubits(transmon)
Quantum information processing [Phys. Rev. Lett. 110, 120503(2013)](Memory, repeater)
Optical-microwave conversion [ShB, Phys. Rev. Lett. 109, 130503 (2012)]
Strong Nonlinearity [Phys. Rev. B 67 134302 (2003)]
23
Why mechanical resonators? applications
Bridges different systems with different charactristics [Phys. Scr. T 137 014001(2009)]:a. Coupling with several qubits: atom, ion, and molecule
b. Coupling with BECs
c. Superconducting qubits(transmon)
Quantum information processing [Phys. Rev. Lett. 110, 120503(2013)]
Optical-microwave conversion [ShB, Phys. Rev. Lett. 109, 130503 (2012)]
Strong Nonlinearity [Phys. Rev. B 67 134302 (2003)]
24
Why mechanical resonators? applications
Bridges different systems with different charactristics [Phys. Scr. T 137 014001(2009)]:a. Coupling with several qubits: atom, ion, and molecule
b. Coupling with BECs
c. Superconducting qubits(transmon)
Quantum information processing [Phys. Rev. Lett. 110, 120503(2013)]
Optical-microwave conversion [ShB, Phys. Rev. Lett. 109, 130503 (2012)]
Strong Nonlinearity [Phys. Rev. B 67 134302 (2003)]
25
Why mechanical resonators? applications
Bridges different systems with different charactristics [Phys. Scr. T 137 014001(2009)]:a. Coupling with several qubits: atom, ion, and molecule
b. Coupling with BECs
c. Superconducting qubits(transmon)
Quantum information processing [Phys. Rev. Lett. 110, 120503(2013)]
Optical-microwave conversion [ShB, Phys. Rev. Lett. 109, 130503 (2012)]
Strong Nonlinearity [Phys. Rev. B 67 134302 (2003)]
26
We need mechanical cooling
Presentation outline
Mechanical resonatorsRadiation pressureOptomechanical cavityMicrowave cavity and electromechanicsTheory of the Optomechanical cavity/cooling
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Radiation pressure Simplest form of radiation pressure coupling is the momentum transfer due to reflection.
Single photon transfers the momentum
the cavity round trip time
the radiation pressure force caused by one intracavity photon
Rev. Mod. Phys. 86, 1391(2014) 30
Presentation outline
Mechanical resonatorsRadiation pressureOptomechanical cavityMicrowave cavity and electromechanicsTheory of the Optomechanical cavity/cooling
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Optomechanical cavity
Rev. Mod. Phys. 86, 1391(2014) 32
Optomechanical cavity
Rev. Mod. Phys. 86, 1391(2014) 33
Optomechanical cavity
1ng mass and 1MHz frequency
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Optomechanical cavity
1ng mass and 1MHz frequency
Rev. Mod. Phys. 86, 1391(2014) 35
Optomechanical cavity
Rev. Mod. Phys. 86, 1391(2014) 36
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All
optic
al c
aviti
es
Presentation outline
Mechanical resonatorsRadiation pressureOptomechanical cavity
Microwave cavity and electromechanicsTheory of the Optomechanical cavity/cooling
IPM-Dec 2016 39
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Si3N4 electromechanics
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Si3N4 electromechanics
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Si3N4 electromechanics
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Si3N4 electromechanics
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SOI electromechanics
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Presentation outline
Mechanical resonatorsRadiation pressureOptomechanical cavityMicrowave cavityTheory of the Optomechanical cavity/cooling
IPM-Dec 2016 53
Cooling
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Cooling
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Cooling
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Cooling
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Optomechanical Quantum equations of motion
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Optomechanical Quantum equations of motion
Optomechanical Classical equations of motion
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Optomechanical Quantum equations of motion
Optomechanical Classical equations of motion
no vacuum fluctuations
Classical random force
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Optomechanical Quantum equations of motion
Optomechanical Classical equations of motion
no vacuum fluctuations
Classical random force
multistability, self induced oscillations, chaos,…
l i bil61
Linearization Analyze the quantum dynamics around classical mean values due to classical random forces and quantum noise on mirror and cavity
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Linearization Analyze the quantum dynamics around classical mean values due to classical random forces and quantum noise on mirror and cavity
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Linearization Analyze the quantum dynamics around classical mean values due to classical random forces and quantum noise on mirror and cavity
Small nonlinear term
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Linearization Analyze the quantum dynamics around classical mean values due to classical random forces and quantum noise on mirror and cavity
Small nonlinear term
naaaaaaalyze the quantum dynamics around classical mean values due to classical rrrrrrrrdddddddd quantum noise on mirror and cavity
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Optomechanical cooling
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Optomechanical cooling
Anti-Stokes scattering
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Optomechanical cooling
Anti-Stokes scattering
Stokes scattering
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Optomechanical cooling
Anti-Stokes scattering
Stokes scattering
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Optomechanical cooling
Anti-Stokes scattering
Stokes scattering
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Optomechanical cooling
Anti-Stokes scattering
Stokes scattering
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Optomechanical cooling
Anti-Stokes scattering
Stokes scattering
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Cavity field mediates mechanical cooling, weak coupling regime
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Cavity field mediates mechanical cooling, weak coupling regime
backaction
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Cavity field mediates mechanical cooling, weak coupling regime
backaction
Optical spring effect(softening)
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Conclusion Applications of mechanical resonatorsPhysic of mechanical resonatorsOptomechanical cavitiesMicrowave eletromechanicsOptomechanical cooling
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low-pressure chemical vapor deposition(LPCVD)
(i) LPCVD of stoichiometric Si3N4 on both sides of a 200 μm thick silicon substrate, (ii) C4F8:SF6 plasma etch through the nitride membrane defining the mechanical beam resonator and pull-in cuts on the top side, and membrane windows on the bottom side,(iii) electron beam lithography, aluminum deposition, and lift-off steps to pattern the microwave circuit(iv) final release of the nitride membrane using a silicon-enriched tetramethylammoniumhydroxide (TMAH) solution
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1 cm × 1 cm chips diced from a high-resistivity siliconon-insulator (SOI) wafer manufactured by SOITEC usingthe Smart Cut process [22]. The SOI wafer consists ofa 300 nm thick silicon device layer with (100) surfaceorientation and p-type (Boron) doping with a specifiedresistivity of 500 Ω-cm. Underneath the device layer isa 3 μm buried silicon dioxide (SiO2) BOX layer. Thedevice and BOX layers sit atop a silicon (Si) handle waferof thickness 675 μm and a specified resistivity of 750 Ω-cm. Both the Si device layer and handle wafer are grownusing the Czochralski crystal growth method.Fabrication of the coupled coil resonator and H-slotresonator can be broken down into the following six steps.In step (1), we pattern the H-slot resonator using electron beam (e-beam) lithography in ZEP-520A resist, andetch this pattern into the Si device layer using an inductively coupled plasma reactive ion etch (ICP-RIE). Afterthe ICP-RIE etch, we clean the chips with a 4 min piranha bath and a 12 sec buffered hydrofluoric acid (BHF)dip. In step (2), we pattern the capacitor electrodes andground plane region using ZEP-520A resist and use electron beam evaporation to deposit 60 nm of Al on thechip. In step (3), we define a protective scaffold formedout of LOR 5B e-beam resist to create the crossover re-
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