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bhapi
  • Member for 4 years, 10 months
  • Last seen more than 4 years ago
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7 votes
2 answers
4k views

How to show a density matrix is in a pure/mixed state?

7 votes
2 answers
418 views

How should we interpret these quantum logic gates as physical observables?

6 votes
1 answer
495 views

A basic question on circuits and matrix representation

5 votes
2 answers
782 views

Shor 9 qubit code — how are the observables measured and eigenvalues obtained during syndrome measurement?

5 votes
1 answer
376 views

Finding a global phase that transform the Hadamard gate to an element of $SU(2)$ and propose an evolution operator which implements the operation

5 votes
1 answer
322 views

Understanding this description of teleportation

5 votes
2 answers
3k views

What does it mean to express a gate in Dirac notation?

4 votes
1 answer
186 views

State of a system after the second qubit of a Bell state sent through a bit flip error channel

4 votes
2 answers
914 views

What is the relation between POVMs and projective measurements?

3 votes
3 answers
3k views

What is the spectral decomposition of the Pauli $X$ gate?

3 votes
1 answer
2k views

What is the meaning of writing a state in its Bloch representation?

3 votes
2 answers
2k views

Square root of CNOT and spectral decomposition of the Hadamard gate

3 votes
3 answers
1k views

Tips and tricks for constructing circuits to generate arbitrary quantum states

3 votes
1 answer
1k views

Notation for two qubit composite product state

3 votes
1 answer
44 views

Why is $Z_1Z_2$ spanned by this set ? Surely it's too small?

3 votes
1 answer
304 views

Understanding how control gates are written in tensor notation

2 votes
1 answer
183 views

The control phase gate in Quantum fourier transform and the question it brings up regarding control gates in general

1 vote
1 answer
99 views

Error in showing $\operatorname{CPHASE}_{12}=\operatorname{CPHASE}_{21}$ in the matrix representation

1 vote
1 answer
1k views

Performing a measurement in the standard computational basis of a three qubit system on two qubits

0 votes
2 answers
71 views

The correct set of measurement operators on a mutiple qubit system