Controlled photon Fock state generation using arbitrarily weak photonic nonlinearities
AssigneeThe University of Chicago
InventorsAashish Clerk, Andrew Lingenfelter
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Abstract
A method and system that harnesses extremely weak Kerr-type nonlinearities in a single driven cavity to deterministically generate single photon Fock states, and more general photon-blockaded states are disclosed. The disclosed scheme is effective even for nonlinearities that are much smaller than photonic loss in the cavity. The disclosed scheme generates photon-blockade states that are non-Gaussian, exhibit a sharp cut-off in their photon number distribution, and can be arbitrarily close to, for example, a single-photon Fock state. This scheme relies only standard linear and parametric drives, and are hence compatible with a variety of different photonic platforms.
Claims20
A method for generating a non-classical photonic Fock state in a resonant electromagnetic mode of a nonlinear electromagnetic resonator, comprising:
- adjusting and applying a first electromagnetic drive in a first time period to displace the resonant electromagnetic mode from a lab frame into a displaced frame;
- adjusting and applying the first electromagnetic drive and a second electromagnetic drive in a second time period subsequent to the first time period to the nonlinear electromagnetic resonator to generate a photonic Fock state of the resonant electromagnetic mode in the displaced frame with photon number n by turning off a matrix element between photonic Fock states with photon numbers n and n+1, thereby creating a photon blockade between the photonic Fock states with photon numbers n and n+1;
- and
- adjusting and applying the first electromagnetic drive in a third time period subsequent to the second time period to restore the resonant electromagnetic mode into the lab frame from the displaced frame while maintaining the photonic Fock state.
A system for generating a non-classical photonic Fock state;
- comprising:
- a nonlinear electromagnetic resonator having a resonant electromagnetic mode characterized by a resonant frequency and corresponding nonlinearity;
- a first electromagnetic source;
- a second electromagnetic source;
- and
- a controller circuitry configured to:
- control the first electromagnetic source to generate and apply a first electromagnetic drive to the resonant electromagnetic mode in a first time period to displace the resonant electromagnetic mode from a lab frame into a displaced frame;
- control the second electromagnetic source to generate and apply a second electromagnetic drive to the resonant electromagnetic mode in a second time period subsequent to the first time period to generate a photonic Fock state in the resonant electromagnetic mode with photon number n by turning off a matrix element between thereby creating a photon blockade between the photonic Fock state and a next higher photon number state with photon number n+1;
- and
- control the first electromagnetic source to generate and apply the first electromagnetic drive to the resonant electromagnetic mode in a third time period subsequent to the second time period to restore the resonant electromagnetic mode into the lab frame from the displaced frame while maintaining the photonic Fock state.
Dependencies are inferred from the claim text.