5

The log quantum volume of Quirk ( https://algassert.com/quirk ) is 16, because it has a maximum of 16 qubits and can easily do the ~200 gates that are part of the test circuit. The slowest part will be drawing the result. For state vector simulators that don't impose maximum qubit counts, like qsim, the limit is basically available memory and the size of ...


3

Qubits need to be able to share entanglement in order to run quantum algorithms. Qubits without entanglement are essentially classical bits. You can't just have two 50 qubit processors and treat them like a 100 qubit system, it's totally different. If you can share entanglement between the two processors, then you have a 100 qubit processor, not 2x50.


2

I would not say that swap gate changes a topology of a quantum processor as this is given by physical properties of the processor, mainly conectivity among qubits. Swap gate simply switch content of two qubits to overcome non-full connectivity among qubits, hardware topology remains intact. I can imagine that it is possible to group physical qubits into ...


2

What limits the connectedness is ultimately a platform-specific question. For example, in trapped-ion quantum computers, all of the ions are coupled through a collective motional mode such that all qubits are actually "connected", so that the graph of qubit-qubit connections is complete. The more mainstream approach (at least in industry) involves ...


1

The length of the loops determines the quantity called the code distance. The key fact about its effect on the function of the code is the exponential suppression of errors. More precisely, if $d$ is the code distance and $\epsilon_P$ is the physical qubit error rate then the logical qubit error rate $\epsilon_L$ is $$ \epsilon_L \approx c_1 \left(c_2\frac{\...


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