A team of Japanese researchers has discovered significant properties of non-Fock states (iNFS) in quantum technology, revealing their stability through multiple linear optics and paving the way for advancements in optical quantum computing and sensing.
Quantum objects, such as electrons and photons, behave differently from other objects in ways that enable quantum technology. Therein lies the key to unlocking the mystery of quantum entanglement, in which multiple photons exist in multiple modes or frequencies.
In pursuing photonic quantum technologies, previous studies have established the usefulness of Fock states. These are multiphoton, multimode states made possible by cleverly combining a number of one-photon inputs using so-called linear optics. However, some essential and valuable quantum states require more than this photon-by-photon approach.
Now, a team of researchers from Kyoto University and Hiroshima University has theoretically and experimentally confirmed the unique advantages of non-Fock states — or iNFS — complex quantum states requiring more than a single photon source and linear optical elements.
“We successfully confirmed the existence of iNFS using an optical quantum circuit with multiple photons,” says corresponding author Shigeki Takeuchi at the Graduate School of Engineering.
“Our study will lead to breakthroughs in applications such as optical quantum computers and optical quantum sensing,” adds co-author Geobae Park.
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