Question

Which statements are true for logical qubits?

5 Logical qubits can be in superposition

1 Logical qubits consist of one or more physical qubits

2 Logical qubits have a longer coherence time than physical qubits

3Logical qubits are physically realised qubits

4Logical qubits are three-level systems

Answer 1

1] True. Logical qubits are those used for programming which maintains the superposition of |1> and |0> quantum states.

2] False. Logical qubits can be encoded in a physical qubit but it does not consist of one or more physical qubits.

3] True. Physical qubits suffer from decoherence which logical qubits overcome.

4] False. Physical qubits are physically realised qubits. For example: Spin-Up or Spin-Down state of electron.

5] False. Physical qubits are three-level systems.