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Large conditional single-photon cross-phase modulation.

Kristin M Beck1, Mahdi Hosseini1, Yiheng Duan1

  • 1Department of Physics, Massachusetts Institute of Technology, Cambridge, MA 02139; Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, MA 02139.

Proceedings of the National Academy of Sciences of the United States of America
|August 14, 2016
PubMed
Summary
This summary is machine-generated.

Researchers achieved deterministic quantum logic using a novel atomic quantum memory and a single control photon. This breakthrough enables scalable photonic quantum computing by creating entanglement between light and atomic states.

Keywords:
cavity quantum electrodynamicscross-phase modulationelectromagnetically induced transparencyphotonic quantum gatesingle-photon Kerr nonlinearity

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Area of Science:

  • Quantum Information Science
  • Atomic, Molecular & Optical Physics
  • Quantum Computing

Background:

  • Deterministic optical quantum logic is crucial for scalable quantum computing.
  • Existing methods face limitations due to multimode effects in traveling photons.

Purpose of the Study:

  • To demonstrate a nonlinear quantum process for deterministic phase modulation using a single photon.
  • To achieve conditional cross-phase modulation between a stored quantum state and a control photon.

Main Methods:

  • Utilized an atomic quantum memory integrated within a high-finesse optical cavity.
  • Employed a single control photon interacting with the stored signal field.
  • Measured conditional cross-phase shift and confirmed entanglement via concurrence.

Main Results:

  • Demonstrated a large conditional cross-phase shift of [Formula: see text] between signal and control photons.
  • Confirmed deterministic entanglement between signal and control modes with positive concurrence.
  • Achieved phase shifts up to [Formula: see text] via postselection.

Conclusions:

  • The demonstrated approach overcomes limitations of traveling-photon systems.
  • The system shows potential for achieving a π phase shift at low loss.
  • Enables deterministic and universal photonic quantum logic for future quantum computers.