Find answers to your questions about Quantum Computing or help others by answering their Quantum Computing questions.
I am trying to compute cross-correlation on a quantum computer, and I have found a research paper describing the cross-correlation algorithm. The terms used in the algorithm are not clear,...
Asked on 08/20/2021 by arc111
1 answerConsider an entangled bipartite quantum state $rho in mathcal{M}_d(mathbb{C}) otimes mathcal{M}_{d'}(mathbb{C})$ which is positive under partial transposition, i.e., $rho^Gamma geq 0$. As separability of $rho$ is equivalent...
Asked on 08/20/2021 by mathwizard
0 answerOften when reading about QC algorithms the Authors assume the existence of an Oracle. I understand this is so that they can focus on the overall structure of the algorithm,...
Asked on 08/20/2021
1 answerI am trying to calculate the ground state energy of some simple molecules using 'MolecularGroundStateEnergy' tools in qiskit. When I run the calculations for very small molecules (e.g. H2, HeH+)...
Asked on 08/20/2021
1 answerIf$$P_{+} = |+ranglelangle+|=frac{1}{2}(|0ranglelangle0|+|0ranglelangle1|+|1ranglelangle0| +|1ranglelangle1|)$$and$$P_{-} = |-ranglelangle-|=frac{1}{2}(|0ranglelangle0|-|0ranglelangle1|-|1ranglelangle0| +|1ranglelangle1|),$$then we can choose $lambda_{+}=1$ and $lambda_{-}=-1$, so that $begin {bmatrix}0&1\ 1&0end{bmatrix}$ is a hermitian...
Asked on 08/20/2021 by GaussStrife
2 answerIf I create a QuantumCircuit, I can save all the information necessary to reconstruct the circuit using the qasm method. In addition, these qasm strings can be sent directly to...
Asked on 08/20/2021
1 answerI would like to play with a quantum circuit local_qasm_simulator in QISKit, but I do not want to implement a separate quantum circuit that would prepare an initial state. The...
Asked on 08/19/2021
1 answerGiven a mixed state with a $n$ qubit density matrix of the following structure:$$rho=pmatrix{lambda_1&&&&nu&lambda_2 &&lambda_{dots} &&&lambda_2 nu&&&&lambda_1},$$so a mixture of a GHZ state and...
Asked on 08/19/2021
1 answerI have 2 qubits which are in an unknown pure state i.e. their density matrix $rho$ can be expressed as $|psiranglelanglepsi|$. Let the initial state be $|psirangle...
Asked on 08/19/2021
2 answerI am trying to understand the Hadamard Test by finding the average value of $U_1$, which is a diagonal matrix with $1$ everywhere except on the first element....
Asked on 08/18/2021
2 answerGet help from others!
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