Harshit Gupta
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Why are Bell states the maximally entangled ones?
3 votes

Entanglement is analogous to correlation. Correlation over a property simply exists where simultaneous determination is not equivalent to individual determination of a property. What does it mean? Say ...

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How to understand combination states vs pure/mixed states?
2 votes

I think you are 'mixing' the terms a bit! I shall take the example of single-qubits to make the analogy simpler but $|\Psi \rangle$ and $| \Phi \rangle$ can be n-qubit states too. Let us first clarify ...

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What are min and max numbers of inputs needed to know whether the 4-bit classical Deutsch-Jozsa algorithm is balanced?
4 votes

Well, the best case scenario corresponds to the minimum tries and worst case to the maximum. Let us first look at the best case. Imagine you make 2 queries to the DJ oracle and you get different ...

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"Classical" phase estimation versus iterative phase estimation
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2 votes

The iterative Quantum Phase Estimation(IQPE) procedure tries to measure the phase associated with a unitary matrix one bit at a time. While the idea of phase kickback used in the original QPE ...

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How to implement parametric iSWAP gate in Qiskit?
2 votes

You can implement an arbitrary unitary matrix as a Unitary Gate using the UnitaryGate class that qiskit provides. This class can be instantiated with an np.ndarray containing the definition of your ...

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Creating orthogonal quantum states from a set of given (possibly linearly independent) quantum states
2 votes

Let us break down the problem into a simpler problem. Since you have n sets of quantum states, and every set is just a tensor product of the constituent states, each of them can be represented as a ...

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How to use the measurement in quantum phase estimation?
1 votes

To answer your first question, whenever you run a QPE circuit on, let's say, $n$ ancilla qubits, you will be left with the binary representation of the phase $\theta$, encoded in the ancilla qubits. ...

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How do I calculate the number of uses of a unitary $U$ in iterative phase estimation?
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2 votes

The IQPE procedure tries to reduce the extra number of ancilla qubits needed to measure the phase and replaces that with the extra number of iterations that we perform to measure our phase. Imagine ...

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QPE Circuit test on Quantum Computer ('ibmq_16_melbourne')
1 votes

Even I have implemented Iterative QPE and the basic QPE in qiskit using approximately the same approach. The point where my simulations also started producing random results was as the phase ...

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