Today's Hard|Forum Post
Today's Hard|Forum Post

Tuesday August 02, 2016

Physics Threesome - Two Atoms One Photon

I will take "Check out the big brain on Brett" for $200 Alex! On a serious note, some smart guys at the University of Messina in Italy think they have figured out a new way to make a quantum switch.

A two-atom, one-photon system could be used as a switch to transmit information in a quantum circuit, Savasta says. One atom would act as a qubit, encoding information as a superposition of the ground and excited states. To transmit the information outside of the cavity, the qubit would need to transfer the information to a photon in the cavity. The second atom would be used to control whether the qubit transmits the information. If the second atom's transition frequency is tuned to half the resonance frequency of the cavity, the two atoms could jointly absorb and emit a single photon, which would contain the encoded information to be transmitted. To ensure that the atoms do not re-adsorb the photon, the atom's resonant frequency can be changed by applying an external magnetic field.

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