README.md

Qlione

Qlione is a quantum simulator with pretty circuit DSL in Scala. It is implemented compactly without library dependencies.

Features

• notation for complex number & matrix & bra-ket
• pipeline operator to match circuit data flow
• type-level sized bits & gate
• auto normalization in factories
• equality without global phase

Examples

import java.util.Random

import com.github.piyo7.qlione.Complex._
import com.github.piyo7.qlione.QuGate._
import com.github.piyo7.qlione._
import com.github.piyo7.qlione._OptNat._

import scala.math.Pi

object Main extends App {
  // Pauli-Y gate
  // (0, -i)
  // (i,  0)
  assert(Y * (|(0).> + (1 + 1.i) * |(1).>) == ((1 - 1.i) * |(0).> + 1.i * |(1).>).bits[_1])

  // quantum Fourier transform
  val result/*: QuBits[_3]*/ =
    (|("000").> + |("100").>).bits[_3] |>
      (H          x I          x I) |>
      (Rz(Pi / 2) . C          x I) |>
      (Rz(Pi / 4) x I)         . C  |>
      (I          x H          x I) |>
      (I          x Rz(Pi / 2) . C) |>
      (I          x I          x H)

  assert(result.reverse == (|("000").> + |("010").> + |("100").> + |("110").>).bits[_3])

  // quantum measurement is probabilistic
  implicit val random = new Random(42)

  println(result)
  println(result.reverse)
  for (_ <- 0 to 10) println(result.reverse.measureAll)
}

Getting Started

Qlione is published on GihHub Pages.

resolvers += "qlione" at "https://piyo7.github.io/qlione/maven"

libraryDependencies += "com.github.piyo7" %% "qlione" % "0.1.0"

Motivation

See slides on ScalaMatsuri 2018.

https://www.slideshare.net/TaokatomoTorigoe/lets-simulate-a-quantum-computer-with-pretty-scala

Origin of Name

"Qunatum".head	"Clione".tail