Quantumtechnology reaches unprecedented control over captured light PRX_Quantum
Present address: Quantum Machines Unit, Okinawa Institute of Science and Technology Graduate University, Onna-son, Okinawa 904-0495, Japan.The ability to store and manipulate quantum states is one of the milestones on the road to building a quantum computer. However, the"quantumness" of quantum states, which is measured by a property called coherence, can be easily destroyed by interactions with the environment.
In our work, we show a technique to create any non-trivial quantum state of microwave photons in a 3D-cavity by coupling it to a superconducting qubit. The states are created by applying a sequence of a few displacement pulses, sent to the cavity, and qubit pulses. The latter exploit the dispersive qubit-cavity interaction to realize arbitrary phase rotations of the cavity field, conditioned on the photon number in the cavity, which are known as"SNAP" gates.
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