More efficient optical quantumgates PhysRevX
Click to ExpandOptical quantum information processing has been tremendously successful, but further progress in the field is hampered by the low efficiency of the two-qubit quantum gates realized so far. These gates take two photons as input and then, after some manipulation, transmit both; low efficiency means a low probability that both photons are transmitted. Despite major efforts, the record of the experimentally achieved efficiency, approximately 11%, has not improved in the past 20 years.
This breakthrough is based on a new experimental platform, in which an ultracold gas of a few hundred atoms is positioned inside an optical resonator. Two photons enter the setup and then depart with their polarizations altered by atomic interactions in the cavity. This implements a controlledWe accomplish this with a process called electromagnetically induced transparency.
Theoretical study suggests that even higher efficiency can be expected in the present platform with further technical improvements. This work opens many new possibilities in optical quantum information processing, in which almost all advanced protocols could profit from high-efficiency gates.
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