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Quantum Mechanic's user avatar
Quantum Mechanic's user avatar
Quantum Mechanic
  • Member for 3 years, 1 month
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15 votes

What is a Haar random quantum state?

7 votes
Accepted

If the partial traces $\rho_A,\rho_B$ are pure, does it imply that $\rho$ is a product state?

7 votes
Accepted

Does the symmetric logarithmic derivative operator have a geometric interpretation?

7 votes

Why is there there an infinite number of possible bases but only a finite number of measurement outcomes

6 votes
Accepted

Unit vanishes in the Quantum Cramer-Rao Bound?

6 votes
Accepted

What are spin-coherent states?

5 votes
Accepted

What does "generator" mean in the master equation?

5 votes
Accepted

Is the global phase of qubits important if qubits interact with each other?

5 votes
Accepted

Does post selection of a qubit introduce non-linearity?

4 votes
Accepted

How to derive the quantum Fisher information from the relative entropy?

4 votes
Accepted

Is Quantum Cramer-Rao bound for single parameter always attainable?

4 votes

Do quantum gates rotate a qubit around the Bloch sphere, or do quantum gates rotate the Bloch sphere around a qubit?

4 votes

Are entanglement breaking channels of any use?

4 votes
Accepted

What does it mean for a channel to be independent of the input state?

4 votes

How to normalise when the probability of measurement is zero?

4 votes
Accepted

Why is a state Gaussian if and only if its covariance matrix satisfies $\boldsymbol\sigma+i\boldsymbol\Omega\ge0$?

4 votes
Accepted

Why is there no angle for the $z$ axis in the Bloch sphere?

4 votes
Accepted

How to implement projective measurement from multiple measurements?

4 votes
Accepted

What happens if I superimpose my quantum computer?

4 votes
Accepted

What is a general entangled bipartite system?

4 votes
Accepted

What do the numbers mean in the elements used in ion traps?

4 votes
Accepted

What is the relation between the purity of a bipartite state and its subsystems?

3 votes
Accepted

Truncated Qumode States and Support

3 votes
Accepted

How to compute the QFI of a thermal state?

3 votes
Accepted

How are quasiprobabilities calculated when sampling from a nonsimulated ibm backend

3 votes
Accepted

How to compute the SLDs for pure single-qubit states?

3 votes

Is the trace distance upper bounded by the Euclidean distance?

3 votes
Accepted

How to avoid measurement in Quantum Computing?

3 votes
Accepted

Trace distance between mixed state and pure state vs trace distance between their purifications

3 votes

What is the probability $\Pr(\|U-I\|_{\rm op}<\varepsilon)$ of a Haar-random unitary being close to the identity?