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Quantum LETI: interfaces

Published on 13 November 2018


Quantum Leti: interfaces

Coupling spin qubits to mechanical resonators

The frequencies of what could soon become quantum processors are typically in the microwave domain (between 1 and 10 GHz). But optical frequencies remain the best option for long-distance communications because of the very low losses in optical fibers. Thus a coherent interface between the microwave frequencies and the optical frequencies is necessary. A promising candidate to achieve this conversion is a mechanical nanoresonator (NEMS) because of its multi-scale properties. In the short term, the coupling between a microwave cavity and a CMOS-compatible silicon mechanical nanoresonator will be studied. The resonator will be pushed into its quantum regime by combining active and passive cooling techniques. In the mid-term, optical addressing of the same mechanical nanoresonator will be implemented to perform microwave / optical conversion. This project is based on the complementary skills of the Néel Institute (cryogenics, superconducting microwave resonators) and Leti (NEMS and VLSI optomechanics).

A nanomechanical resonator fabricated in LETI's clean room
A microwave component mounted at the top of an inverted dilution refrigerator

Most relevant publications:

  • Regal CA, Teufel JD, Lehnert KW. Measuring nanomechanical motion with a microwave cavity interferometer. Nat Phys. juillet 2008;4(7):555‑60.
  • Xue F, Wang YD, Liu Y, Nori F. Cooling a micromechanical beam by coupling it to a transmission line. Phys Rev B. 1 nov 2007;76(20):205302.
  • Teufel JD, Donner T, Castellanos-Beltran MA, Harlow JW, Lehnert KW. Nanomechanical motion measured with an imprecision below that at the standard quantum limit. Nat Nanotechnol. déc 2009;4(12):820‑3.
  • Clerk A. Measurement: Facing Heisenberg at the nanoscale. Nat Nanotechnol. déc 2009;4(12):796‑8.
  • Rouxinol F, Hao Y, Brito F, Caldeira AO, Irish EK, LaHaye MD. Measurements of nanoresonator-qubit interactions in a hybrid quantum electromechanical system. Nanotechnology. 2016;27(36):364003.
  • Palomaki TA, Harlow JW, Teufel JD, Simmonds RW, Lehnert KW. Coherent state transfer between itinerant microwave fields and a mechanical oscillator. Nature. 14 mars 2013;495(7440):210‑4.



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