What code fragment codes the equivalent circuit if you remove the barrier in the following QuantumCircuit?

• A.qc = QuantumCircuit(1,1)
  qc.h(0)
  qc.z(0)
  qc.h(0)
  qc.measure(0,0)
• B.qc = QuantumCircuit(1,1)
  qc.h(0)
  qc.s(0)
  qc.h(0)
  qc.measure(0,0)
• C.qc = QuantumCircuit(1,1)
  qc.h(0)
  qc.t(0)
  qc.tdg(0)
  qc.h(0)
  qc.measure(0,0)
• D.qc = QuantumCircuit(1,1)
  qc.measure(0,0)

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Given a Quantum circuit below,
qft = QuantumCircuit(1)
qft.ry(math.pi / 2, 0)
qft.s(0)
Which of the below statement, measures the outcome of the quantum circuit?

• A.qft.measure(1)
• B.qft.measure(0,0)
• C.qft.measure(0)
• D.qft.measure_all()

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Which quantum error correction code is designed to protect against phase-flip errors?

• A.Shor code
• B.Surface code
• C.Steane code
• D.Reed-Muller code

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Which of the below option will implement an operator that represents a single qubit -gate?

• A.op = Operator([[0,i]])
• B.
• C.op = Operator([[1,0,0,1]])
• D.op = Operator([[i,0,0,i]])

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In quantum computing, what is the significance of multiple measurements of the same qubit?

• A.It helps in reducing the effects of quantum noise
• B.It improves quantum gate efficiency
• C.It ensures quantum entanglement among qubits
• D.It accelerates the overall quantum computation process

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