Entanglement of atoms and photons at a telecom wavelength for quantum networking
OwnerMark Saffmaninventor
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Abstract
A method for generating a time-bin encoded telecom wavelength photon is disclosed herein. The method includes preparing a superposition state in an atom in a trap, exciting, at a first time, to an excited state, where the excited state decays along a path to a decay state of the atom and the telecom wavelength photon, transforming the decay state, and exciting, at a second time t2, to an excited state, where the excited state decays along a path to a decay state of the atom and the telecom wavelength photon.
Claims20
A method for generating a time-bin encoded telecom wavelength photon, the method comprising:
- (a) preparing a superposition state in an atom in a trap, wherein the superposition state is |ψ>=(|0>+|1>)/√{square root over (2)};
- (b) exciting, at a first time t1, state |1> to an excited state |d>, wherein the excited state |d> decays along path |d>→|p>→|1> to a decay state of the atom and the telecom wavelength photon |Ψ>=(|0>+|1>|v>t1|va>t1)/√{square root over (2)} and |v>t1 representing the telecom wavelength photon generated at time t1 by the decay between states |d> and |p> and |va>t1 representing an additional photon generated at time t1;
- (c) transforming the decay state |Ψ>, wherein the transformed state is |Ψ>=(|0>|v>t1+|1>)/√{square root over (2)};
- and
- (d) exciting, at a second time t2, state |1> to the excited state |d>, wherein the excited state |d>decays along path |d>→|p>→|1> to a decay state of the atom and the telecom wavelength photon |Ψ>=(|0>+|v>t1+|1>|v>t2)/√{square root over (2)} and |v >t2 representing the telecom wavelength photon generated at time t2 by the decay between states |d> and |p>.
A method for generating a polarization encoded telecom wavelength photon, the method comprising:
- (a) preparing a superposition state in an atom in a trap, wherein the superposition state is |v/>=(|0>+|1>)/√{square root over (2)};
- (b) exciting state |1> to an excited state |d1> and state |0> to an excited state |d0>, wherein the excited state |d1>decays along path |d1>→|p1 >→|1> and the excited state |d0>decays along path |d0>→|p0>→|0> to a decay state of the atom and the telecom wavelength photon |Ψ>=(|0>|σ−>+|1 >|σ+>)/√{square root over (2)} where |σ_> and |σ+>represent telecom wavelength photon generated by the decay between states |d0> and |p0> and |d1> and |p 1>, respectively.
A method for entangling an atom and a photon, the method comprising:
- (a) applying a first polarized light pulse to the atom in state |1 to couple state |1 to a first excited state |p,
- (b) applying a polarized telecom wavelength photon have an opposite polarization to the first polarized light pulse to cause the transition of the first exited state |p to a second excited state |d,
- (c) applying a second polarized light pulse having the same polarization as the first polarized light pulse to couple the second excited state |d to a ground state |0.
Dependencies are inferred from the claim text.