Highly entangled photons and rapidly responding polarization qubit phase gates in a room-temperature active Raman gain medium

Journal Article · Mon Nov 15 04:00:00 EST 2010 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.82.053818· OSTI ID:21528734

Chao, Hang ^[1]; Guoxiang, Huang ^[1]

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1. State Key Laboratory of Precision Spectroscopy and Department of Physics, East China Normal University, Shanghai 200062 (China)

We present a scheme for obtaining entangled photons and quantum phase gates in a room-temperature four-state tripod-type atomic system with two-mode active Raman gain (ARG). We analyze the linear and nonlinear optical responses of this ARG system and show that the scheme is fundamentally different from those based on electromagnetically induced transparency and hence can avoid significant probe-field absorption as well as a temperature-related Doppler effect. We demonstrate that highly entangled photon pairs can be produced and rapidly responding polarization qubit phase gates can be constructed based on the unique features of the enhanced cross-phase-modulation and superluminal probe-field propagation of the system.

• OSTI ID: 21528734
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 5 Vol. 82; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
AMPLIFICATION
BOSONS
DOPPLER EFFECT
ELEMENTARY PARTICLES
FREQUENCY MODULATION
GAIN
INFORMATION
MASSLESS PARTICLES
MODULATION
NONLINEAR PROBLEMS
PHOTONS
POLARIZATION
QUANTUM ENTANGLEMENT
QUANTUM INFORMATION
QUBITS
RAMAN EFFECT
TEMPERATURE RANGE
TEMPERATURE RANGE 0273-0400 K