<ul><li>Integrated quantum photonics </li></ul>Jeremy O’Brien NEDQIT € : £: $: ¥:
<ul><li>Quantum technologies </li></ul><ul><li>Photonic approach </li></ul><ul><li>Quantum circuits on silicon chips </li>...
Physical is quantum     Quantum information No  physical  representation    No information No  physical  process    No ...
Quantum mechanics <ul><li>A description of the world at small scales </li></ul><ul><li>Quantized </li></ul><ul><li>Inheren...
<ul><li>Normal  bit     quantum bit or ‘ qubit ’: </li></ul><ul><li>a two-level quantum mechanical system  </li></ul><ul>...
<ul><li>Entanglement </li></ul>
<ul><li>Entanglement </li></ul>Entanglement is “ the  characteristic trait of quantum mechanics, the one that enforces its...
Franson  Phys. Rev. Lett .  62,  2205–2208 (1989) Communication JL O’Brien, A Furusawa, J Vuckovic  Nature Photonics ,  3 ...
<ul><li>Encoding Quantum Information in Photons </li></ul>JL O’Brien  Science ,  318 , 5856 (2007)
2-photon interactions?
 
<ul><li>Photonic Controlled-NOT gate </li></ul>Milburn,  PRL   62 , 2124 (1989) Control Target IN OUT 00 00 01 01 10 11 11...
 
<ul><li>Quantum information with photons </li></ul>Knill, Laflamme and Milburn  Nature   409 , 46 (2001)
<ul><li>Non-classical interference </li></ul>x 50% BS P   = P(  ) + P(  )
<ul><li>Non-classical interference </li></ul>P   = | + | 2 50% BS
Information processing Lanyon  et al.   Nature Physics   5  134 (2009) O’Brien , et al. ,  Nature  426  264 (2003)  O’Brie...
 
<ul><li>Integrated quantum photonics </li></ul>~25 mm Politi, Cryan, Rarity, Yu, and O’Brien   Science,   320 ,   5876 (20...
<ul><li>CNOT gate on a chip </li></ul>Laing, Peruzzo, Politi, Rodas Verde, Halder, Ralph, Thompson, O’Brien  arXiv:1004.03...
<ul><li>Manipulation of Entanglement on a chip </li></ul>Matthews, Politi, Stefanov, and O’Brien Nature Photonics  3 , 346...
<ul><li>Quantum factoring algorithm on a chip </li></ul>Politi, Matthews, O’Brien  Science  325  1221 (2009)
<ul><li>Quantum factoring algorithm on a chip </li></ul>Politi, Matthews, O’Brien  Science  325  1221 (2009)
<ul><li>Quantum walks in SiO x N y </li></ul>Peruzzo,  Matsuda, Matthews , Politi,  Poulios, Lobino, Zhou, Wórhoff, Brombe...
<ul><li>Two- particle quantum walks </li></ul>Peruzzo,  Matsuda, Matthews , Politi,  Poulios, Lobino, Zhou, Wórhoff, Bromb...
<ul><li>Conclusions </li></ul>Quantum Communication & Computing Reconfigurable circuits & Precision measurement Quantum si...
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J O'Brien Presentation - Think Small Event

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BEN Event - 20/04/10 - Think Small, NSQI Building, University of Bristol.

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J O'Brien Presentation - Think Small Event

  1. 1. <ul><li>Integrated quantum photonics </li></ul>Jeremy O’Brien NEDQIT € : £: $: ¥:
  2. 2. <ul><li>Quantum technologies </li></ul><ul><li>Photonic approach </li></ul><ul><li>Quantum circuits on silicon chips </li></ul>
  3. 3. Physical is quantum  Quantum information No physical representation  No information No physical process  No processing  Revolution in information and communication technologies “ Information is physical” - Rolf Landauer
  4. 4. Quantum mechanics <ul><li>A description of the world at small scales </li></ul><ul><li>Quantized </li></ul><ul><li>Inherently uncertain </li></ul><ul><ul><li>eg . position-momentum ‘uncertainty principle’ </li></ul></ul><ul><li>Very counter intuitive </li></ul><ul><li>… and very useful </li></ul>
  5. 5. <ul><li>Normal bit  quantum bit or ‘ qubit ’: </li></ul><ul><li>a two-level quantum mechanical system </li></ul><ul><li>eg. the polarisation of a single photon: </li></ul><ul><li>Quantum information </li></ul>‘ Superposition’ + JL O’Brien Science , 318 , 5856 (2007) 0 1
  6. 6. <ul><li>Entanglement </li></ul>
  7. 7. <ul><li>Entanglement </li></ul>Entanglement is “ the characteristic trait of quantum mechanics, the one that enforces its entire departure from classical lines of thought.” - Schrödinger, 1935 …
  8. 8. Franson Phys. Rev. Lett . 62, 2205–2208 (1989) Communication JL O’Brien, A Furusawa, J Vuckovic Nature Photonics , 3 , 687 (2009) Security based on Physics Lithography Ladd, et al Nature 464, 45 (2010) Computation Tremendous power Metrology Precision measurement
  9. 9.
  10. 10. <ul><li>Encoding Quantum Information in Photons </li></ul>JL O’Brien Science , 318 , 5856 (2007)
  11. 11. 2-photon interactions?
  12. 13. <ul><li>Photonic Controlled-NOT gate </li></ul>Milburn, PRL 62 , 2124 (1989) Control Target IN OUT 00 00 01 01 10 11 11 10 0 1 Control Target 0 1 Non-linear phase shift
  13. 15. <ul><li>Quantum information with photons </li></ul>Knill, Laflamme and Milburn Nature 409 , 46 (2001)
  14. 16. <ul><li>Non-classical interference </li></ul>x 50% BS P = P( ) + P( )
  15. 17. <ul><li>Non-classical interference </li></ul>P = | + | 2 50% BS
  16. 18. Information processing Lanyon et al. Nature Physics 5 134 (2009) O’Brien , et al. , Nature 426 264 (2003) O’Brien, Science , 318 5856 (2007) Communication Clark, Fulconis, Rarity, Wadsworth, O’Brien Phys. Rev. A 79 030303 (2009) Nagata, Okamoto, O’Brien, Sasaki, Takeuchi Science , 316 726 (2007); NJP 10 073033 (2008) Metrology Entanglement Okamoto, O’Brien, Hofmann, Nagata, Sasaki, Takeuchi Science , 323 483 (2009)
  17. 20. <ul><li>Integrated quantum photonics </li></ul>~25 mm Politi, Cryan, Rarity, Yu, and O’Brien Science, 320 , 5876 (2008)
  18. 21. <ul><li>CNOT gate on a chip </li></ul>Laing, Peruzzo, Politi, Rodas Verde, Halder, Ralph, Thompson, O’Brien arXiv:1004.0326 Ideal: Expected: Measured: F = 0.969 ± 0.002 S = 0.993 ± 0.002
  19. 22. <ul><li>Manipulation of Entanglement on a chip </li></ul>Matthews, Politi, Stefanov, and O’Brien Nature Photonics 3 , 346 (2009)
  20. 23. <ul><li>Quantum factoring algorithm on a chip </li></ul>Politi, Matthews, O’Brien Science 325 1221 (2009)
  21. 24. <ul><li>Quantum factoring algorithm on a chip </li></ul>Politi, Matthews, O’Brien Science 325 1221 (2009)
  22. 25. <ul><li>Quantum walks in SiO x N y </li></ul>Peruzzo, Matsuda, Matthews , Politi, Poulios, Lobino, Zhou, Wórhoff, Bromberg, Lahini, Silberberg, Thompson, O’Brien
  23. 26. <ul><li>Two- particle quantum walks </li></ul>Peruzzo, Matsuda, Matthews , Politi, Poulios, Lobino, Zhou, Wórhoff, Bromberg, Lahini, Silberberg, Thompson, O’Brien
  24. 27. <ul><li>Conclusions </li></ul>Quantum Communication & Computing Reconfigurable circuits & Precision measurement Quantum simulations +Sources & Detectors

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