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bilanush
  • Member for 5 years, 3 months
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8 votes
3 answers
6k views

Composing the CNOT gate as a tensor product of two level matrices

6 votes
1 answer
751 views

Decomposition of any 2-level matrix into single qubit and CNOT gates

5 votes
1 answer
3k views

What's a vector in the Bloch sphere representation?

5 votes
1 answer
2k views

The meaning of measurements in different bases

4 votes
2 answers
1k views

Why isn't the circuit performing a measurement in the Bell basis?

4 votes
2 answers
538 views

What is the meaning of the state $|1\rangle-|1\rangle$?

4 votes
1 answer
87 views

Are superdense coding and teleportation just a prototype or the 'only' type?

3 votes
1 answer
188 views

In error correction code why don't we imitate the Hamming code instead of the complicated Steane code?

3 votes
1 answer
134 views

How does the actual measurement collapsing an error to an orthogonal basis look like?

3 votes
1 answer
172 views

Do the probability amplitudes describe the probability of projective measurement?

3 votes
2 answers
613 views

What does an observable in a different basis mean physically?

3 votes
1 answer
187 views

What's the point of quantum gates being 'continuous'?

2 votes
2 answers
263 views

Why is measurement needed in teleportation?

2 votes
1 answer
245 views

Why is a density operator defined the way it's defined?

2 votes
2 answers
219 views

Why is it that the Pauli matrices and error correction operator act only on $|\psi\rangle\langle \psi|$ and not on state vector $|\psi\rangle$ itself?

2 votes
2 answers
584 views

The relationship between entanglement of vector states to matrix operations

2 votes
1 answer
75 views

Is there a place online where I can catch up with all the notational syntax associated with quantum computing?

2 votes
1 answer
198 views

Why does phase flip correction error? Why could any error be written as a linear combination of I, X, Z and ZX matrices?

2 votes
1 answer
210 views

How does Steane code use the classical Hamming code for error correction?

2 votes
1 answer
477 views

If CNOTs and single qubit gates are universal then why do we need to prove that controlled U operations can be composed by them as well?

1 vote
1 answer
182 views

What does it mean to perform a measurement in correspondence with different projections?

1 vote
3 answers
1k views

Is it correct to say that we need controlled gates because unitary matrices are reversible?

1 vote
1 answer
648 views

What does it mean that copying a state is impossible but creating a copy of by entangling is possible?

1 vote
1 answer
1k views

Clarification needed for the N&C proof that BQP ⊆ PSPACE

0 votes
1 answer
201 views

Why does $|P_U − P_V |$ equal $\langle \psi |U^{\dagger} M U|\psi\rangle −\langle \psi |V^{\dagger} M V |\psi\rangle$?