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Decoherence Suppression of a Solid State Qubit Using Uncollapsing

Decoherence Suppression of a Solid State Qubit Using Uncollapsing. Kyle Michael Keane Alexander N. Korotkov. University of California, Riverside. We thank John Martinis’ Group (UCSB) for their cooperation. Other Proposed Methods. Quantum Error Correcting Codes

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Decoherence Suppression of a Solid State Qubit Using Uncollapsing

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  1. Decoherence Suppression of a Solid State Qubit Using Uncollapsing Kyle Michael Keane Alexander N. Korotkov University of California, Riverside We thank John Martinis’ Group (UCSB) for their cooperation

  2. Other Proposed Methods • Quantum Error Correcting Codes • Complicated and Resource Hungry • Decoherence-Free Subspace • Complicated and Resource Hungry • Dynamical Decoupling • Does Not Protect Against Markovian Processes

  3. Protocol: 11 T=0 storage period t storage period t Prepared Partial (p) Pi Rotation Pi Rotation Partial (pu ) Our Method: Phase Qubit almost the same as existing experiment!

  4. Phase Qubit: Partial Measurement (PM) Bloch Equations

  5. Phase Qubit: Effect of Null Result Partial Measurement (NRPM) The NRPM reduces the probability that the qubit is in state after the NRPM is complete

  6. Relaxation Probability The probability that a qubit relaxes during a ZTER period is proportional to the probability that it was in state at the beginning of the ZTER period ZTER: Zero Temp Energy Relaxation

  7. Protocol: 11 T=0 storage period t The probability that the qubit relaxes during the storage period is proportional to the probability that it was in state at the beginning of the storage Phase Qubit: Intuitive Understanding The first PM reduces the probability that the qubit is in state after the PM is complete

  8. Storage (t) ResultsIdeal Operations Prep PM(p) p-Pulse p-Pulse Ideal PM(pu) without uncollapsing QPT fidelity (Favs, F) measurement strength p

  9. storage period t Partial (p) Prepared Pi Rotation Partial (pu ) Pi Rotation Non-Ideal Operations Protocol: 11 T=0 storage period t

  10. ResultsNon-Ideal Operations fidelity as in expt. } without uncollapsing probability QPT fidelity (Favs, F) measurement strength p

  11. Conclusions Decoherence Suppression by Uncollapsing: • Requires NO Extra Resources • Protects Against Markovian Processes • Works Even With Non-Ideal Operations • Can Be Experimentally Realized With a Very Simple Extension of a Previous Experiment

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