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Error in Check Your Understanding #5161

@ChickenAgent2227

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@ChickenAgent2227

URL to the relevant course

https://quantum.cloud.ibm.com/learning/en/courses/quantum-diagonalization-algorithms/vqe#23-factors-that-determine-computational-cost

Section 2.3

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  • new content request
  • typo
  • code bug
  • out-of-date content
  • broken link
  • other

Describe the fix or the content request.

The answer given to the Check Your Understanding question is incorrect.

The question is: "Consider a Hamiltonian on four qubits that contains the terms:

IIXX, IIXZ, IIZZ, IZXZ, IXXZ, ZZXZ, XZXZ, ZIXZ, ZZZZ, XXXX

You want to sort these terms into groups such that all terms in a group can be measured simultaneously. What is the smallest number of such groups you can make such that all terms are accounted for?"

The correct answer should be 4, not 5. Example solution:

  • IIXX, IIZZ, XXXX, ZZZZ
  • IIXZ, IZXZ, ZIXZ, ZZXZ
  • IXXZ
  • XZXZ

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(No answer)

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