A simple quantum computer simulator in R.
Install the programming language R if you have not done so yet.
Download the source code, e.g. with
git clone https://github.com/HISKP-LQCD/qsimulatR.git
and go into the newly created directory qsimulatR.
Execute:
./install
You might have to install additional packages. Just use install.packages() for any packages recommended in a possible error message.
The install script might not work under Windows. To circumvent this, you can download the source package from github. Then
install.packages("qsimulatR.zip", repos=NULL, type="source")
The library qsimulatR is now available in your R installation and can be loaded with:
library(qsimulatR)
Check for updates regularly. Do so by going into the directory qsimulatR and executing
git pull
./install
A detailed usage description can be found in qsimulatR.pdf. We provide many useful examples in the R Markdown format in vignettes.
Your first very simple program with qsimulatR might look like this:
library(qsimulatR)
# generate a quantum state with 2 qubits, initialised to |00>
x = qstate(nbits=2)
# display the state
x
# apply the Hadamard gate to the first (right) qubit
y = H(1) * x
y
# apply a controlled NOT
z = CNOT(c(1,2)) * y
z
# draw the resulting circuit
plot(z)
# project onto a single compute basis state
res = measure(z)
# draw the circuit
plot(res$psi)
# perform the measurement many times and plot the outcome
dist = measure(z, rep=1000)
hist(dist)