Deterministic and cascadable conditional phase gate for photonic qubits
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Chudzicki-2013-Deterministic and cascadable.pdf
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Author(s)
Chudzicki, Christopher Alan
Shapiro, Jeffrey H.
Chuang, Isaac L.
Date Issued
April 2013
Journal
Physical Review A
Publisher
American Physical Society
Citation
Chudzicki, Christopher, Isaac L. Chuang, and Jeffrey H. Shapiro. "Deterministic and cascadable conditional phase gate for photonic qubits." Phys. Rev. A 87, 042325 (April 2013). © 2013 American Physical Society
Version
Final published version
Abstract
Previous analyses of conditional φ[subscript nl]-phase gates for photonic qubits that treat cross-phase modulation (XPM) in a causal, multimode, quantum field setting suggest that a large (∼π rad) nonlinear phase shift is always accompanied by fidelity-degrading noise [J. H. Shapiro, Phys. Rev. A 73, 062305 (2006); J. Gea-Banacloche, Phys. Rev. A 81, 043823 (2010)]. Using an atomic ∨ system to model an XPM medium, we present a conditional phase gate that, for sufficiently small nonzero φ[subscript nl], has high fidelity. The gate is made cascadable by using a special measurement, i.e., principal-mode projection, to exploit the quantum Zeno effect and preclude the accumulation of fidelity-degrading departures from the principal-mode Hilbert space when both control and target photons illuminate the gate. The nonlinearity of the ∨ system we study is too weak for this particular implementation to be practical. Nevertheless, the idea of cascading through principal-mode projection is of potential use to overcome fidelity-degrading noise for a wide variety of nonlinear optical primitive gates.
MIT Department
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Research Laboratory of Electronics
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DOI of Published Version
https://doi.org/10.1103/PhysRevA.87.042325
