  A semiconducting nanowire with strong Rashba coupling and in proximity of a
superconductor hosts Majorana edge modes. An array of such nanowires with
inter-wire coupling gives an approximate description of a two-dimensional
topological superconductor, where depending on the strength of the magnetic
field and the chemical potential, a rich phase diagram hosting trivial and
different types of non-trivial phases can be achieved. Here, we theoretically
consider such a two-dimensional assembly of spin-orbit coupled superconducting
nanowires and calculate the collective tunneling conductance between normal
electrodes and the wires in the topological regime. When the number of wires in
the assembly is $N$, as a consequence of the way the Majorana bonding and
anti-bonding states form, we find that $N$ conductance peaks symmetric about
the bias $V = 0$ appear, for even $N$. When $N$ is odd, a ZBCP also appears.
Such an assembly can be realized by standard nano-fabrication techniques where
individual nanowires can be turned $ON$ or $OFF$ by using mechanical switch (or
local top gating) to make $N$ either even or odd -- thereby switching the ZBCP
$OFF$ or $ON$, respectively. Hence, our results can be used to realize and
detect topological superconductivity efficiently, unambiguously and in a
controlled manner.
