draks ...
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Is there a separable state that is furthest away from an entangled one?
0 votes

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Find the decomposition of the following matrix into two level unitary matrices
1 votes

This is a Quantum Fourier Transform and the Wiki page provides a generic decomposition: Can you find your two qubit version?

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Problems in understanding the solution for "Mermin–Peres Magic Square Game"
2 votes

Not an answer yet, but to long for comment: Alice and Bob share two entangled pairs. Now look only at Alice's. The last line gives the state that only one of'em has: $$\frac1{\sqrt 2}(|00〉+|11〉) =\...

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Any other quantum algorithms than Jozsa-Deutsch decision algorithm, Grover search algorithm, Shor factorization algorithm?
0 votes

There is A Polynomial Quantum Algorithm for Approximating the Jones Polynomial For simple knots, you can do that with 2 qubits...

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Quantum circuit CCX optimization for Grover
Accepted answer
2 votes

Instead of saving the information of a single comparison into a y qubit, you can use a controlled adder. Instead of $n$ y qubits you would only need $\log_2 n$.

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Probabilities does not sum up to 1 in simple circuit
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2 votes

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Will two entangled qubits be affected by gravity?
3 votes

Let's start with the Bell state $\frac1{\sqrt2}(|01\rangle+|10\rangle)$. Let's further assume that the entire universe (or at least the parts of relevance) are pervaded by a static magnetic field ...

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Composition of tensor product
Accepted answer
1 votes

The simple answer is: yes...$ $

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Result of Grover on Qiskit simulator
0 votes

3 out of 4 states are inverted, that leads to the following situation before you do the Grover Diffusion, which mirror around the red line: This will bring the all states to zeros, but not $|11\...

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How many two-qubit gates are required to implement a general N-qubit unitary?
2 votes

In Elementary gates for quantum computation it is conjectured that based on dimension counting, ... a lower bound on the number of two-bit gates required to produce an arbitrary $n$-bit unitary ...

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