**Programming language**: Rust

**License**: MIT License

**Tags**: Virtualization

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## README

## quantum

*Advanced Rust quantum computer simulator.*

### Motivation

Quantum is a quantum computer simulator written with the following design goals in mind:

1) **Utility:** we can simulate a 5-qubit register, enough to run interesting algorithms.

2) **Efficiency:** we implement all important operations from scratch using primitives

3) **Educational Value:** the documentation is a prose description of how to implement a quantum computer in Rust.

4) **Correctness:** it's entirely written in safe Rust with well-defined states.

A good place to start reading the theory behind this is the Wikipedia article, and you can follow the documentation for our implementations of gates, kets, common operations, and quantum registers.

### Usage

```
# Cargo.toml
[dependencies]
quantum = "0.1.3"
```

```
// main.rs
use computer::QuantumComputer;
use algorithms::deutsch;
use gates;
// Let's do something simple of a 3-qubit system.
let mut c1 = QuantumComputer::new(3);
c1.initialize(5);
c1.apply(gates::identity(3));
c1.collapse();
assert_eq!(5, c1.value());
// Now let's perform a coin flip using the Hadamard transform.
let mut c2 = QuantumComputer::new(1);
c2.initialize(0);
c2.apply(gates::hadamard(1));
c2.collapse();
let result = if 1 == c2.value() { "heads" } else { "tails" };
println!("coin flip: {}", result);
// Finally let's determine whether f: {0, 1} -> {0, 1} is constant
// or balanced using Deutsch's algorithm.
// (see http://physics.stackexchange.com/q/3400)
let mut c3 = QuantumComputer::new(2);
c3.initialize(1);
c3.apply(gates::hadamard(2));
c3.apply(deutsch::deutsch_gate(f));
c3.apply(gates::hadamard(2));
c3.collapse();
let result = if 1 == c3.value() { "constant" } else { "balanced" };
println!("f is: {}", result);
```

### Gates

We provide the following quantum gates:

*Identity**Hadamard**Pauli-X**Pauli-Y*-
*Pauli-Z* -
*Phase Shifts* -
*Swap* -
*Sqrt(Swap)* -
*Controlled Not* *General Controlled-U**Controlled-X**Controlled-Y**Controlled-Z*-
*Toffoli* -
*Fredkin* *Quantum Fourier Transform*

### Contributing

- Create or take ownership of an issue
- Fork
*development*branch - Write code and tests
`rust test`

- Commit with a reasonable message and push
- Submit a pull request

*
*Note that all licence references and agreements mentioned in the quantum README section above
are relevant to that project's source code only.
*