• Decoherence control in quantum computing with simple chirped pulses

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      Permanent link:
      https://www.ias.ac.in/article/fulltext/pram/059/02/0235-0242

    • Keywords

       

      Coherent control; multiphoton excitation; pulse shaping; quantum logic gates

    • Abstract

       

      We show how the use of optimally shaped pulses to guide the time evolution of a system (‘coherent control’) can be an effective approach towards quantum computation logic. We demonstrate this with selective control of decoherence for a multilevel system with a simple linearly chirped pulse. We use a multiphoton density-matrix approach to explore the effects of ultrafast shaped pulses for two-level systems that do not have a single photon resonance, and show that many multiphoton results are surprisingly similar to the single-photon results. Finally, we choose two specific chirped pulses: one that always generates inversion and the other that always generates self-induced transparency to demonstrate an ensemble CNOT gate.

    • Author Affiliations

       

      Debabrata Goswami1

      1. Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai - 400 005, India
    • Dates

       
  • Pramana – Journal of Physics | News

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