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gate_defs.go
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gate_defs.go
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// Copyright 2011 Google Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// Author: conleyo@google.com (Conley Owens)
package quantum
import (
"math"
)
// Hadamard Gate
func NewHadamardGate(bits int) *Gate {
d := float64(int(1 << uint(bits>>1)))
if bits&1 == 1 {
d *= math.Sqrt2
}
p := complex(1.0/d, 0)
n := -p
return NewFuncGateNoCheck(func(row int, col int) complex128 {
// Calculate (-1)**<i,j> / sqrt(2**n)
par := 0
for anded := row & col; anded > 0; anded >>= 1 {
par ^= anded & 1
}
if par == 1 {
return n
}
return p
},
bits)
}
func Hadamard(qreg *QReg, target int) {
NewHadamardGate(1).Apply(qreg, []int{target})
}
func HadamardRange(qreg *QReg, target_range_start int, target_range_end int) {
target_range_size := target_range_end - target_range_start
gate := NewHadamardGate(target_range_size)
gate.ApplyRange(qreg, target_range_start)
}
func HadamardReg(qreg *QReg) {
HadamardRange(qreg, 0, qreg.width)
}
// Diffusion Gate
func NewDiffusionGate(bits int) *Gate {
a2 := complex(2.0/float64(int(1<<uint(bits))), 0)
a2m1 := a2 - complex(1.0, 0)
return NewFuncGate(func(row int, col int) complex128 {
if row == col {
return a2m1
}
return a2
},
bits)
}
func Diffusion(qreg *QReg, target int) {
NewDiffusionGate(1).Apply(qreg, []int{target})
}
func DiffusionRange(qreg *QReg, target_range_start int, target_range_end int) {
target_range_size := target_range_end - target_range_start
gate := NewDiffusionGate(target_range_size)
gate.ApplyRange(qreg, target_range_start)
}
func DiffusionReg(qreg *QReg) {
DiffusionRange(qreg, 0, qreg.width)
}