While Quantum Computing may feel like a new buzzword, it’s been around for quite a long time. What started as a theoretical idea in the 1980s is slowly becoming a reality.
Quantum computing is a form of computation that harnesses the power and potential of Quantum Mechanics. Unlike classical computing that works with transistors and bit values 0 and 1, quantum computing uses the properties exhibited by subatomic particles to perform computations and solve problems too complex for classical computers.
It utilizes what’s known as qubits, which can have values 0, 1, or both 0 and 1 at the same time. This property of having two values at the same time is a feature of superposition and is only possible within quantum states and not classical ones.
Devices that perform quantum computations are known as quantum computers. These are specially designed and maintained to be able to harness the various properties of quantum states. It is seen that quantum computers are gaining tremendous attention and are considered to be the future of computing.
Any problem that can be solved by a classical computer can be solved by a quantum computer. More importantly, some potential applications that become possible or exponentially more efficient with Qubits include:
- Quantum Chemistry & computer-aided drug design
- Simulating quantum systems
- Machine learning
- Computational biology
Here we are going to have a look at how to use the Q.js library to create a Bell state circuit and simulate it. The Bell state is a special and important quantum circuit involving two qubits. It creates entangled pairs of qubits which have various uses. This circuit is designed using a Hadamard gate(H) and a Controlled-Not gate(CX).
First, download the build folder from the Q.js library repo in GitHub. It has the basic structure to begin building your first quantum circuit using Q.js. It also has a
build.sh file but we will not be using it.
You should see something like this on your webpage
The result of simulating any quantum circuit is the probability of getting a particular combination as the output. You can simulate the above circuit using the
report$() method (It returns the results as a string).
To display the results on your webpage in a cleaner way you can use the
split() method (split at newline) and save the probability for each two-qubit combination as an array element.
Because of how
.report$() works the first and last element of the array will be empty strings. The rest of the elements can be displayed on the webpage by adding them to a div and appending it to the body.
Your final result will look something like this:
There’s no question that quantum computing is going to forever change the cloud. When that day comes, you want a cloud provider that you can trust to stay at the forefront of computing without making life harder for you. Codesphere is the first cloud provider that lets you work directly in the cloud environment through an IDE and terminal. Check us out!