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heromano
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8 votes
3 answers
449 views

If a Hamiltonian is quadratic in the ladder operator, why is its time evolution linear in the ladder operator?

7 votes
2 answers
1k views

How can one argue that the $S$-gate is Clifford while $T$-gate is not?

5 votes
1 answer
559 views

Which states can reached using single-qubit Clifford gates?

5 votes
3 answers
1k views

Why is the transpose of a density matrix positive and trace preserving?

4 votes
3 answers
115 views

Why does joint ground state not change under action of beam splitting unitary operator?

4 votes
1 answer
715 views

Logical bit-flip and Phase-flip operators of Shor’s 9-qubit code

4 votes
2 answers
431 views

Fermionic occupation operator and nearest neighbor Fermionic hopping interaction as a qubit operator

3 votes
1 answer
210 views

How can I construct a universal transformation using Clifford+T gates? [duplicate]

2 votes
1 answer
195 views

How can one argue that the partial transpose $\rho^{T_B}$ of a general separable state is positive?

2 votes
1 answer
465 views

Fermionic commutation relation using Jordan-Wigner transformation

2 votes
1 answer
189 views

Adiabatic Quantum Computer e intermediate Hamiltonian evolves the state within the manifold

1 vote
1 answer
412 views

In Shor’s 9-qubit code, is the error syndrome for qubit 5 phase-flip the same as that for qubit 6 phase-flip?

1 vote
1 answer
219 views

Is there an easy way to calculate the eigenvalues of the partial transpose of a given matrix? [duplicate]

1 vote
1 answer
174 views

What is the logarithmic Negativity of the Werner state? [closed]

0 votes
3 answers
338 views

How to prove that the transpose operation maps an arbitrary qubit to its complex conjugate?

-1 votes
1 answer
199 views

How do I calculate the eigenvalues of the positive partial transpose of this two-qubit state?

-1 votes
2 answers
356 views

Error syndrome on logical operators

-1 votes
1 answer
248 views

Reduced density matrix of the ensemble of two-qubit state that is possessed by Alice and Bob