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. 2011 Feb 15;2:198. doi: 10.1038/ncomms1201

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(a) The response of the mechanical oscillator measured via the lock-in amplifier with f_p=2f₀+Δ where Δ=0 Hz and f_s=f₀+δ reveals the fundamental mode f_s and the idler f_i=f₀−δ. (b) The corresponding theoretical response generated from equation (9) (Methods). (c) The response of the mechanical oscillator measured via the lock-in amplifier, with f_pA=2f₀+Δ and f_pB=2f₀−Δ where Δ=0.5 Hz, and f_s=f₀+δ reveals, in addition to f_s, the two first-order idlers and and two second-order idlers that can be used to implement mechanical logic gates. (d) The corresponding numerical simulation except equation (9) is modified to include two pumps, and all the higher order idlers are labelled (Methods). In all cases, the experimental response is broader than the numerical simulations because of an experimental resolution band width (RBW) of 50 mHz.

Inline graphic — (a) The response of the mechanical oscillator measured via the lock-in amplifier with f_p=2f₀+Δ where Δ=0 Hz and f_s=f₀+δ reveals the fundamental mode f_s and the idler f_i=f₀−δ. (b) The corresponding theoretical response generated from equation (9) (Methods). (c) The response of the mechanical oscillator measured via the lock-in amplifier, with f_pA=2f₀+Δ and f_pB=2f₀−Δ where Δ=0.5 Hz, and f_s=f₀+δ reveals, in addition to f_s, the two first-order idlers and and two second-order idlers that can be used to implement mechanical logic gates. (d) The corresponding numerical simulation except equation (9) is modified to include two pumps, and all the higher order idlers are labelled (Methods). In all cases, the experimental response is broader than the numerical simulations because of an experimental resolution band width (RBW) of 50 mHz.