Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 113, Issue 35, Pages 9740-9744Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1524117113
Keywords
cross-phase modulation; photonic quantum gate; cavity quantum; electrodynamics; electromagnetically induced transparency; single-photon Kerr nonlinearity
Categories
Funding
- National Science Foundation (NSF)
- Multidisciplinary University Research Initiative through Air Force Office of Scientific Research
- NSF Integrative Graduate Education and Research Traineeship [0801525]
- Multidisciplinary University Research Initiative through Army Research Office
- Direct For Education and Human Resources
- Division Of Graduate Education [0801525] Funding Source: National Science Foundation
- Direct For Mathematical & Physical Scien
- Division Of Physics [1505862] Funding Source: National Science Foundation
- Division Of Physics
- Direct For Mathematical & Physical Scien [1205554, 1125846] Funding Source: National Science Foundation
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Deterministic optical quantum logic requires a nonlinear quantum process that alters the phase of a quantum optical state by pi through interaction with only one photon. Here, we demonstrate a large conditional cross-phase modulation between a signal field, stored inside an atomic quantum memory, and a control photon that traverses a high-finesse optical cavity containing the atomic memory. This approach avoids fundamental limitations associated with multimode effects for traveling optical photons. We measure a conditional cross-phase shift of pi/6 (and up to pi/3 by postselection on photons that remain in the system longer than average) between the retrieved signal and control photons, and confirm deterministic entanglement between the signal and control modes by extracting a positive concurrence. By upgrading to a state-of-the-art cavity, our system can reach a coherent phase shift of pi at low loss, enabling deterministic and universal photonic quantum logic.
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