Qubit-Coupled Mechanics - IFSC

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Next step: Dispersive measurements of the number-state statistics of a mechanical mode Perform spectroscopy on the qubit while it is coupled to the mechanical resonator ω = 300 MHz 2π χ = 0.6 MHz 2π k B T~1.7ħω Qubit Linewidth γ qq = 0.5 MHz 2π Absorption spectrum of qubit for nanoresonator in thermal state at T = 25 mm Absorption Rate (A.U.) *Calculations based on CLERK & UTAMI, PRA 75, 042302 (2007) ‘Stark’-Shifted Qubit Transitions N = 2 N = 1 N = 0 … N = 0 Simulation of Stark Shift … ∆E + ħχ |−⟩ |+⟩ 2 ∆E + 5ħχ 1 ∆E + 3ħχ N = 1 0.1 1.0 10 ω s − ΔE (MHz) 0 N = 2
Engineering the qubit read-out: Embed Qubit-Mechanics in Superconducting LC Circuit ω p ∼ 50 Ω Feedline Cryo Amp L C C Q Qubit State Changes LC Frequency - Probe By Transmission Measurement of Feedline
Page 1 and 2: Qubit-Coupled Mechanics Matt LaHaye
Page 3 and 4: Mechanical Systems in the Quantum R
Page 5 and 6: What do We Hope to Accomplish With
Page 7 and 8: The Future: Quantum Machines?
Page 9 and 10: What does it take to get to the qua
Page 11 and 12: Thermal Noise E Energy Spectrum The
Page 13 and 14: Chasing the Ground State Cooling th
Page 15 and 16: Approaching the Ground State: Back-
Page 17 and 18: Limitations of Linear Displacement
Page 19 and 20: Schematic of Coupling Between a Coo
Page 21 and 22: Schematic of Coupling Between a Coo
Page 23 and 24: The Dispersive Coupling Limit Inter
Page 25 and 26: First Realization of Qubit-Coupled
Page 27 and 28: Milestone in Quantum Measurement Na
Page 29: The Dispersive Coupling Limit *See:
Page 33 and 34: Present Status of Our Efforts at Sy
Page 35 and 36: LC Circuit Read-out of Qubit vs. Ap
Page 37 and 38: Details of the UHF Flexural Nanomec
Page 39 and 40: LC Read-out of Qubit: Two-Tone Spec
Page 41 and 42: Two-Tone Spectroscopy - ‘Extra’

Qubit-Coupled Mechanics - IFSC

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