deepprobe to access verilogA

Not with deepprobe, because that just creates an iprobe between two nodes - and the real number is not a node.

You could access it with $cgav in a Verilog-A model. Using this Verilog-A model would do the trick:

//

`include "disciplines.vams"
module measure (op);
output op;
electrical op;

parameter string path="I1.R1.vpot";
real measured;

analog begin
  measured=$cgav(path,"param");
  //$strobe(measured);
  V(op)<+measured;
end
endmodule

However, if you instantiate this in your test bench and set the path param to the hierarchical path to the variable you want (with dots as the separator), it will fail with an error saying that the output contribution is from a cds_get_analog_value and so can't properly control convergence. You can avoid this by adding -va,cgav_in_contrib to the Spectre command-line options (in ADE via User Command Line Options in Setup→Environment). You should be careful though - if the variable changes instantaneously, that will causes discontinuities (perhaps there should be a transition() around the measured in the model above? In other words, caveat emptor.

Andrew