Abstract
We present a model of discrete quantum computing focused on a set of discrete quantum states. For this, we choose the set that is the most outstanding in terms of simplicity of the states: the set of Gaussian coordinate states, which includes all the quantum states whose coordinates in the computation base, except for a normalization factor \(\sqrt{2^{-k}}\), belong to the ring of Gaussian integers \(\mathbb {Z}[i]=\{a+bi\ |\ a,b\in \mathbb {Z}\}\). We also introduce a finite set of quantum gates that transforms discrete states into discrete states and generates all discrete quantum states, and the set of discrete quantum gates, as the quantum gates that leave the set of discrete states invariant. We prove that the quantum gates of the model generate the expected discrete states and the discrete quantum gates of 2-qubits and conjecture that they also generate the discrete quantum gates of n-qubits.
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We usually represent these vectors by their decimal encodings, for example \(|1001\rangle =|9\rangle \), so in a system of n qubits the computational base is represented by \(\{|0\rangle ,|1\rangle ,\ldots ,|2^n-1\rangle \}\).
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Gatti, L.N., Lacalle, J. A model of discrete quantum computation. Quantum Inf Process 17, 192 (2018). https://doi.org/10.1007/s11128-018-1956-0
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DOI: https://doi.org/10.1007/s11128-018-1956-0