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Mechanical resonators towards quantum limit:
NEMS group
together withNANO,
THEORY, KVANTTI
Mika Sillanpää assoc. prof., team leaderJuha-Matti Pirkkalainen MSc, grad studentGolam Kibria Chowdhury MSc, grad studentJaakko Sulkko undergrad studentErno Damskägg undergrad student
Mika Sillanpää, Low Temperature Laboratory
Quantum limit of moving objects Optomechanics
Cohadon, PRL 83, 3174 (1999).Gigan, Nature 444, 67 (2006).Kippenberg, Science 321, 1173 (2008).
wc /(2 ) p ~ 1014 Hzwm /(2 ) p ~ 106 Hz
gc/(2 ) p ~ 106 Hzgm/(2 ) p ~ 100 Hz
Mika Sillanpää, Low Temperature Laboratory
Circuit optomechanics Microwave resonator
(”cavity”) with a movable boundary condition
Like an LC circuit with time-dependent capacitors
Mika Sillanpää, Low Temperature Laboratory
Circuit optomechanics High-impedance ”cavity” Focused Ion Beam (FIB) cutting of narrow vacuum gaps
(~10 nm)
Mika Sillanpää, Low Temperature Laboratory
Circuit optomechanics Mechanical microwave
amplification
Coupling of mechanical resonators via cavity “quantum bus”
F. Massel et al, Nature, 480, 351 (2011).
Mika Sillanpää, Low Temperature Laboratory
Cavity QED with phonons “Artificial atom” (transmon qubit) coupled to both
photonic and phononic cavity
Mika Sillanpää, Low Temperature Laboratory
Cavity QED with phonons Phonon Stark shift
ultrastrong light-matter coupling
Mika Sillanpää, Low Temperature Laboratory
Cavity QED with phonons Electromechanical Rabi
flops Photon – phonon
conversion
Motional sidebands “Trapped-ion” experiments
Mika Sillanpää, Low Temperature Laboratory
Future Coupling of micromechanical
resonators via ”cavity bus” Coherent phonon transfer in time domain Slowing down (and superluminal!)
microwave pulses Coupling to Josephson junction qubits
Increase coupling further Create non-classical states of purely
mechanical object Circuit optomechanics with graphene
large zero-point amplitude xZP ~ 1 pm cool it near the ground state Single-phonon strong coupling
Mika Sillanpää, Low Temperature Laboratory
Mechanical resonators towards quantum limit:
Circuit optomechanics Mechanical microwave amplifier
Quantum-limited operation predicted Sideband cooling down to 1.8 phonon
quanta Hybridization of multiple phonons and a photon
phonon bus, creation of entanglement..? Phonon QED
Motional sidebands of qubit spectral line Sideband Rabi oscillations Prospects
Creation of non-classical states of slowly moving objects
Long-lived quantum memory
Mika Sillanpää, NEMS group