Skip to main content
M. Stern's user avatar
M. Stern's user avatar
M. Stern's user avatar
M. Stern
  • Member for 6 years, 1 month
  • Last seen this week
  • Germany
26 votes

If all quantum gates must be unitary, what about measurement?

22 votes

Is error correction necessary?

12 votes
Accepted

Unentangling a qubit from a system: can we convert $\alpha|000\rangle+\beta|111\rangle$ into $\alpha|00\rangle+\beta|11\rangle$?

11 votes
Accepted

What is the quantum circuit equivalent of a (delayed choice) quantum eraser?

9 votes

How to compactly represent multiple qubit states?

8 votes

Who built the first quantum computer using at least two qubits?

6 votes
Accepted

State of the art in quantum memory

6 votes
Accepted

Symmetry of tensor product w.r.t. Vazirani 2-qubit video

4 votes

Is the tensor product of two states commutative?

4 votes
Accepted

Definition of distance d of the QECC $T(S)$

3 votes
Accepted

Do stabilizers of Shor's 9-qubit code all have eigenvalue 1?

3 votes
Accepted

What is the representative matrix for a measurement in the Bell-state basis?

3 votes

How do the probabilities of each state change after a transformation of a quantum gate?

2 votes

Why do error correction protocols only work when the error rates are already significantly low to begin with?

2 votes
Accepted

How are the eigenvalues of $\rho=\frac12(|a\rangle\!\langle a| +|b\rangle\!\langle b|)$ derived?

2 votes

How can one check whether a given quantum state is a graph state?

2 votes
Accepted

How to distinguish logical X vs logical Z in the stabilizer code with $k=1$?

2 votes

Can one interrogate black boxes for quantum coherence?

2 votes
Accepted

What are the two measurements per box being done in the Bell Tests in the IBM Quantum Experience "Entanglement and Bell tests" Section

2 votes
Accepted

What are generators for a "real" Clifford group?

2 votes

What is a non-local state?

1 vote

Can such a transformation be implemented by using just polarizers?

1 vote

Error correction on $n$ qubits all in same state except for a few

0 votes

Why does the qubit give random results in the circuit with rearranged CNOTs for Steane's seven qubit code in Stim?