Sampling of bosonic qubits

TL;DR

This paper extends boson sampling to multi-qubit bosonic sources, enabling sampling over an exponentially large set of output states by leveraging multi-mode spectral distributions and time-correlated measurements.

Contribution

It introduces a method to use single qubit bosonic sources for sampling over all multi-qubit output states, expanding the scope of boson sampling techniques.

Findings

Feasibility of using single qubit bosonic sources for complex sampling.

Sampling over exponential number of multi-qubit output states.

Enhanced capabilities in quantum sampling with multi-mode spectral distributions.

Abstract

The boson sampling problem has brought a lot of attention in the quantum information field because it is not efficiently solvable with a classical computer; nonetheless it can be implemented with linear optical interferometers with single-boson sources. Recently, we introduced a more general problem, the multi-boson correlation sampling problem, which allows us to take advantage of the multi-mode spectral distribution of the bosonic sources together with time-correlated measurements in order to achieve sampling not only over the output ports of the interferometer but also over the joint detection times. This problem was analyzed for both single-photon sources and thermal sources. In this work, we demonstrate that it is possible to use single qubit bosonic sources in order to sample not only over the described "space-time" degree of freedom but also over all the possible exponential number of multi-qubit output states.