A Quantum Computer Simulator.

qsimulatR

A simple quantum computer simulator in R.

Installation

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

Usage

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)