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Update BellStates: allocate qubits inside the loop and remove ResetAll #1447

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Apr 30, 2024
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Update BellStates: allocate qubits inside the loop and remove ResetAll #1447

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9 changes: 2 additions & 7 deletions samples/algorithms/BellState.qs
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Original file line number Diff line number Diff line change
Expand Up @@ -12,9 +12,6 @@ namespace Sample {

@EntryPoint()
operation BellStates() : (Result, Result)[] {
// Allocate the two qubits that will be used to create a Bell state.
use register = Qubit[2];

// This array contains a label and a preparation operation for each one
// of the four Bell states.
let bellStateTuples = [
Expand All @@ -28,6 +25,8 @@ namespace Sample {
// and measure the Bell state qubits.
mutable measurements = [];
for (label, prepare) in bellStateTuples {
// Allocate the two qubits that will be used to create a Bell state.
use register = Qubit[2];
prepare(register);
Message($"Bell state {label}:");
DumpMachine();
Expand All @@ -37,27 +36,23 @@ namespace Sample {
}

operation PreparePhiPlus(register : Qubit[]) : Unit {
ResetAll(register); // |00〉
H(register[0]); // |+0〉
CNOT(register[0], register[1]); // 1/sqrt(2)(|00〉 + |11〉)
}

operation PreparePhiMinus(register : Qubit[]) : Unit {
ResetAll(register); // |00〉
H(register[0]); // |+0〉
Z(register[0]); // |-0〉
CNOT(register[0], register[1]); // 1/sqrt(2)(|00〉 - |11〉)
}

operation PreparePsiPlus(register : Qubit[]) : Unit {
ResetAll(register); // |00〉
H(register[0]); // |+0〉
X(register[1]); // |+1〉
CNOT(register[0], register[1]); // 1/sqrt(2)(|01〉 + |10〉)
}

operation PreparePsiMinus(register : Qubit[]) : Unit {
ResetAll(register); // |00〉
H(register[0]); // |+0〉
Z(register[0]); // |-0〉
X(register[1]); // |-1〉
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