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PhysicsMan
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4 votes
1 answer
828 views

How to obtain $Y$ rotation with only $X$ and $Z$ rotation gates on the Bloch sphere?

3 votes
2 answers
1k views

Why does the triplet state $\dfrac{1}{\sqrt{2}}(\uparrow\downarrow+\downarrow\uparrow)$ have spin 1 and not 0?

2 votes
0 answers
222 views

Tunneling elements in the Hubbard model

1 vote
1 answer
938 views

Constructing singlet state in second quantization formalism

1 vote
0 answers
57 views

Fermion commutation with two quantum numbers

0 votes
1 answer
394 views

Swap operation with the Heisenberg Hamiltonian

0 votes
1 answer
99 views

Gaussian integral extended to multi-dimensions

0 votes
1 answer
326 views

Is the scalar propagator an even function?

0 votes
2 answers
1k views

Pauli matrices as measurement operators versus spin probability

0 votes
3 answers
1k views

What are the units of time when planck's constant is equal to 1?