1. What is transferred in quantum teleportation?The quantum information carried by an input stateThe sender's physical particle itselfA complete classical list of the state's amplitudesOnly a classical measurement outcome from the input

2. How many qubits are involved in the standard single-qubit protocol taught here?One: the input aloneTwo: only the shared Bell pairThree: the input and the two halves of a Bell pairFour: two inputs and two outputs

3. Which shared resource and message are needed for one standard ideal transfer?Two Bell pairs and one classical bitOne Bell pair and two classical bitsOne classical bit and no entanglementTwo classical bits and no entanglement

4. In our circuit, which qubit controls Alice's CNOT gate?Bob's qubit BAlice's Bell-pair qubit AWhichever qubit first produces a measurement outcomeThe input qubit Q

5. After the CNOT, where does Alice apply the Hadamard gate?To Bob's distant qubit BTo the input qubit QTo the two classical message bitsOnly to her Bell-pair qubit A

6. Which definition of m1 and m2 matches this lesson?m1 comes from Q; m2 comes from Am1 comes from A; m2 comes from Bm1 comes from B; m2 comes from Qm1 is an amplitude; m2 is a measurement probability

7. Alice sends m1m2 = 01. What should Bob do?Apply Z onlyApply X and then ZApply no correctionApply X only

8. Alice sends m1m2 = 10. What should Bob do?Apply X onlyApply no correctionApply Z onlyMeasure B instead of correcting it

9. Which correction follows our convention for m1m2 = 11?Apply X twiceApply Z twiceApply X, then ZApply H, then measure B

10. What correction corresponds to m1m2 = 00?X onlyZ onlyH onlyNo correction

11. Why does this protocol not create two copies of an unknown state?Alice's measurements leave her without the original unknown input stateBob's output is always only a classical bitThe Bell pair makes no-cloning temporarily inapplicableAlice sends a second physical copy through the classical channel

12. Why does teleportation not enable faster-than-light communication?Bell pairs can only exist when both qubits touchBob needs classical information from Alice to identify the correctionClassical messages travel instantly but quantum states do notBob already knows every possible input state

13. For an ideal Bell resource, what is the probability of each two-bit message?1/2, because each message contains two bitsThe input's probability of measuring 01, if Alice chooses that message in advance1/4, independent of the input state

14. Alice's two-bit message is lost. What is the sound conclusion?Bob can safely assume the message was 00Bob cannot reliably choose the required correction from that missing messageBob can measure once to learn both missing bits without disturbing the stateThe original state automatically returns to Alice

15. What happens to the shared Bell resource after one completed transfer?It remains an untouched reusable Bell pairIt becomes two independent copies of the input stateIt has been consumed and a new suitable resource is needed for another transferIt is replaced automatically by the classical message

16. In the worked example, Q starts in |0⟩ and the message is 01. What is Bob's state before X?|1⟩|0⟩|+⟩|−⟩

18. Why is measuring only 0/1 frequencies insufficient to verify transfer of |+⟩?|+⟩ always gives the outcome 0Teleportation has no measurable outputsA 50:50 classical mixture gives the same 0/1 frequenciesEvery possible quantum state has identical 0/1 frequencies

19. What can ideal teleportation do when Q is initially entangled with another system R?Always erase the entanglement with RProduce a new copy of R at BobWork only after Q has been measured and its state learnedPreserve the correlations, with Bob's output taking Q's role

20. Five separate qubits are each teleported once using this standard protocol. What are the ideal resource totals?One Bell pair and ten classical bitsFive Bell pairs and ten classical bitsTen Bell pairs and five classical bitsFive Bell pairs and no classical bits

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