Quantum Computing

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First edit.
Awarded 1249 times.
How to efficiently calculate the inverse of a Kronecker product?
Awarded 2 days ago
Measuring in qiskit collapses onto the Z-Plane. Why do any rotations other than Y matter?
Awarded 2 days ago
How to find minimum time needed for Hamiltonian evolution?
Awarded Oct 25 at 3:40
How does measurement change the effective transformation matrix?
Awarded Oct 24 at 4:11
Show that there are unitaries $U_m$ such that $M_m=U_m \sqrt{E_m}$, for any measurement $M_m$ and associated POVM $E_m$
Awarded Oct 23 at 14:12
Qiskit's classifier is not optimising the weights
Awarded Oct 16 at 19:52
Compute expectation value of an operator in openfermion
Awarded Oct 16 at 17:55
How to write the covariance matrix of a quantum gaussian state as a function of photon numbers?
Awarded Oct 14 at 17:53
How is transformation for measurement in an arbitrary basis derived?
Awarded Oct 14 at 17:43
How to compute the measurement probabilities of $|\phi\rangle=\sum_k c_k |k\rangle$ in a rotated basis $V|k\rangle$?
Awarded Oct 11 at 9:49
Measurement of single qubit operator $U$ which is both Hermitian and unitary with eigenvalues $±1$
Awarded Oct 7 at 19:40
Why do stabilizer codes in Nielsen and Chuang have Pauli X and Z matrices?
Awarded Oct 6 at 17:33
Equivalent matrix for operators in qiskit
Awarded Oct 5 at 14:27
Why should we measure in X/Z basis for Z/X errors in Steane syndrome extraction?
Awarded Oct 4 at 14:33
How to create states in Qiskit using complex phase angles?
Awarded Oct 2 at 19:36
(post deleted or otherwise unavailable)
Awarded Oct 2 at 14:09
Qiskit noise model question (from textbook)
Awarded Oct 1 at 12:49
How to express real matrices as linear combinations of unitaries?
Awarded Sep 29 at 14:19
How to analyze the following quantum circuit?
Awarded Sep 27 at 10:47
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Awarded Sep 24 at 19:26
Coherence measurement for density matrix
Awarded Sep 24 at 6:27
Why is it important to perform optical quantum computing with ONLY linear components?
Awarded Sep 23 at 3:34
Amplitude encoding: distinction between negative and positive real values
Awarded Sep 22 at 16:15
Quantum communications and "knowledge" of receiving a qubit
Awarded Sep 21 at 19:17
How large can we make the fidelity between mixed states by allowing unitaries?
Awarded Sep 21 at 10:27
(post deleted or otherwise unavailable)
Awarded Sep 20 at 15:50
Controlled Z gate using Pauli rotation operators and Z tensor product Z
Awarded Sep 19 at 21:05
Definition of Deutsch gate and meaning of $\theta$
Awarded Sep 16 at 3:55
Interpretation of the unitaries involved in the eigenvalue decomposition of a density operator
Awarded Sep 16 at 0:41
(post deleted or otherwise unavailable)
Awarded Sep 15 at 11:02
Complexity of quantum circuits in a specific protocol
Awarded Sep 12 at 13:41
What happens measuring the first qubit of a $GHZ$ state in the basis $\{|+\rangle, |-\rangle\}$?
Awarded Sep 10 at 21:10
Qiskit's QFT not returning the expected state
Awarded Sep 10 at 12:55
Prove that rank one projectors have the same partial trace iff they differ by a local unitary operation
Awarded Sep 10 at 11:46
Is this a valid implementation of the balanced Deutsch-Jozsa oracle
Awarded Sep 8 at 7:05
What is the computational complexity limitation of classical client delegated quantum computing CCDQC protocols?
Awarded Sep 7 at 22:41
Do global phases matter when a gate is converted into a controlled gate?
Awarded Sep 7 at 18:27
(post deleted or otherwise unavailable)
Awarded Sep 6 at 9:36
Where does the term $|\psi\rangle\langle\psi|$ come from while calculating the expectation value?
Awarded Sep 6 at 0:05
Callback in VQC does not return correct float value for objective function evaluation
Awarded Sep 5 at 17:16
Error when running a VQE circuit in IBMQ backends
Awarded Sep 4 at 16:06
How universal is the Toffoli gate for classical reversible computing?
Awarded Sep 3 at 21:33
How is Grover's algorithm used in reducing duration of time taken to brute-force a hash? [duplicate]
Awarded Sep 3 at 5:15
How to calculate state fidelity in Qiskit?
Awarded Aug 29 at 3:33
Is there any universal gate set with an efficient word problem?
Awarded Aug 29 at 2:27
Do VQE and QAOA use the same Hamiltonian?
Awarded Aug 27 at 16:08
Get the probability amplitudes of the 0 and 1 states of a single qubit in Qiskit considering a system of multiple qubits
Awarded Aug 27 at 8:32
Can we do error correction for entangled particles?
Awarded Aug 24 at 19:04
How to calculate the spectral norm of the density operator used in Molina et al. 2012 paper?
Awarded Aug 24 at 11:05
What are min and max overlaps of a maximally entangled state with a separable state?
Awarded Aug 23 at 5:06
(post deleted or otherwise unavailable)
Awarded Aug 22 at 10:36
Approximate Cloning
Awarded Aug 15 at 22:46
Qiskit - Circuit drawing aesthetics - Can I force the measurements in my circuit to show at the end?
Awarded Aug 13 at 1:05
Applying projectors with mid-circuit measurements
Awarded Aug 11 at 18:21
Partial Cyclic Permuation with only Toffoli and CNOT gates?
Awarded Aug 11 at 1:27
Elementary question: is $\langle a|b \rangle$ the same as $\langle a||b\rangle$?
Awarded Aug 10 at 4:17
QAOA for Binary Optimization
Awarded Aug 9 at 18:47
Introductory material for quantum machine learning
Awarded Aug 9 at 3:43
unexpected effect of coherent unitary error in qiskit
Awarded Aug 8 at 23:05
How is outer product an operator?
Awarded Aug 8 at 6:16
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