All Questions
Tagged with programming quantum-algorithms
152 questions
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How do you apply the Hadamard function to a register of qubits in Q#?
I am learning Q# and am trying to create Deutsch's algorithm. My code seems to have an issue since I'm still learning. The code recognizes that line 3 contains an error. Can someone tell me what I am ...
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Challenges in Comparing Classical and Quantum Optimization Methods
Has anyone attempted to solve a simple optimization problem using both classical and quantum optimization methods and compared the results?
I have tried multiple times, but the quantum method has ...
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Could Gödel's incompleteness theorem have parallels in quantum computing phenomena?
Gödel's incompleteness theorem deals with the limits of formal mathematical systems, showing that there are true statements that cannot be proven within the system. Given the probabilistic and non-...
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Why does stim::FrameSimulator work?
I have read the main stim paper and understood it.
I understand the concept of propogating a Pauli Frame and having a reference Frame. I understand that we want to multiply Z into a pauli frame with ...
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I have trouble using the alternatives for some commands in older versions of qiskit
I have a code that calculates the transition amplitute between and using the ZZFeatureMap with 4 repetitions and default data mapping function. Use the qasm_simulator with shots = 8192, seed_simulator ...
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QPE implementation with 4 qubits
I'm trying to implement a circuit for QPE, i start with 4 qubits but the results are incorrect (even for 3 or 5 qubits).
the used unitary gate is : ...
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Cannot Find referance DeutschJozsa in __init__.py
I am new to quantum computing and Python. I tried to make a quantum simulation with qiskit, but I have some import issues that I can't solve, and I decided to ask it here.
I tried to import ...
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Can quantum computers eventually be programmed "normally"?
They tell us that eventually quantum computers will break all current encryption methods. On the other hand, current quantum computers are programmed at a very low, mathematical level and for very ...
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Transpilation error: CircuitError: 'The amount of qubit(0)/clbit(0) arguments does not match the gate expectation (2).'
I am trying to implement a algoritm that reduces the number of qubits required for MAXCUT optimization. I need to create a custom gate that encodes a diagonal unitary matrix where the diagonal ...
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Reducing Estimator time for calculating expectation values
I have a circuit with $2N + 1$ qubits and with depth $2t + 2$, where $t$ is essentially the number of trotter steps, or the number of times a fixed block of gates repeats itself in the circuit. After ...
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General number of classical bits: recycles qubits
I am trying to write a Qiskit routine to perform qubit recycling for Shor's algorithm. This is a procedure by which the M-bit control register is replaced by a single quantum register, and the ...
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Can non-linear operations be implemented as a circuit on a quantum computer?
Suppose I have a Quantum circuit, which gives an output state $|\psi \rangle$ let's say. I wish to obtain the reduced density matrix by tracing out subsystem B, i.e. $\rho = |\psi \rangle \langle \psi ...
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Hamiltonian Simulation: What's the meaning of t in $\exp(iAt)$?
My main goal is to find eigenvalues of some hamiltonian matrix $A$. When implementing Quantum Phase Estimation, I need to provide my circuit with informations about $A$. From what I have seen so far, ...
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Pauli Strings on the same qubit?
I am working on solving a Max-Cut problem using fewer qubits via efficient encoding methods of more classical information onto a single qubit.Using the method of
The original problem has the ...
