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Quantum Coherent Control with Non-classical Light

Quantum Coherent Control with Non-classical Light. Department of Physics of Complex Systems The Weizmann Institute of Science Rehovot, Israel. Yaron Bromberg, Barak Dayan, Avi Pe’er, Itai Afek, Yaron Silberberg. The Ultrafast Optics Group. THG images of biological specimen.

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Quantum Coherent Control with Non-classical Light

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  1. Quantum Coherent Controlwith Non-classical Light Department of Physics of Complex SystemsThe Weizmann Institute of Science Rehovot, Israel Yaron Bromberg, Barak Dayan, Avi Pe’er, Itai Afek, Yaron Silberberg The Ultrafast Optics Group

  2. THG images of biological specimen Femtosecond Pulse Shaping Phase, amplitude and polarization synthesizer Spectral plane SLM 10 fs pulses @ 800 nm ~130 nm FWHM

  3. QCC with Non-classical Light … what does it really mean? Can we shape a single photon? … and what is it good for?

  4. Spontaneous Parametric Down-conversion non linear crystal signal pump idler a pump photon is spontaneously converted into two lower frequency photons momentum conservation (phase matching) energy conservation

  5. The two-photon wavefunction (2) SIGNAL (cw) PUMP (cw) IDLER (cw) Continuous Broadband Down-conversion:Time-Energy Entangled Photons

  6. Gate Time-Energy Entangled Photons signal (cw) non linear crystal pump (cw) Shaper idler (cw) • The time DIFFERENCE between the photons behaves as a fs pulse … so lets shape the two-photon correlation function ! • But electronics limits temporal resolution to ~ns

  7. 1. Hong-Ou-Mandel Interference 2. Instantaneous nonlinear interaction between photons How can we get fs resolution?

  8. Two-Photon Coincidence Interference :Hong-Ou-Mandel Dip Shaper (2) “Measurement of Subpicosecond Time Intervals between Two Photons by Interference” C.K. Hong, Z.Y. Ou and L. Mandel, PRL 59 (1987) SIGNAL PUMP d IDLER

  9. HOM in polarization V X Y H V 2 type-I crystals generate polarization entanglement and broad spectrum Fourier Plane Computer 1 V Pump 364 nm φ SLM H 2 PBS A. V. Burlakov et. al. , PRA 64, (2001)

  10. Experimental Setup Fourier Plane Computer 1 crystals V Pump 364 nm SLM H 2 PBS Phase-and-polarization SLM Controls independently the ±45° axes (X,Y)

  11. Experimental Results B. Dayan, Y. Bromberg, I. Afek and Y. Silberberg, in preparation.

  12. 1. Hong-Ou-Mandel Interference 2. nonlinear interaction between photons (instantaneous) How can we get fs resolution?

  13. SIGNAL (CW) (2) (2) CW PUMP Delay IDLER (CW) Delay typical flux SFG efficiency SFG signal Coincidence detection through Sum-Frequency Generation (SFG)

  14. How many ‘single photons’ can arrive in one second ?(How high can ‘low light levels’ be ?) The photon-pair arrives within 1/D A photon-pair per time-bin (n=1 photon per mode)

  15. - photons per mode entangled photons Quantum mechanical analysis of SFG

  16. 1995: Kimble’s group measures a slope of 1.3 at low photon numbers

  17. SFG with Entangled Photons Computer Beam dump IR detector Dispersion compensation PP-KTP PP-KTP SFG crystal Down-converting crystal SPCM pump 532nm 5W SFG 532nm ~40,000 s-1

  18. 0 Intensity Dependence of SFG with Entangled Photons "Nonlinear Interactions with an Ultrahigh Flux of Broadband Entangled Photons", B. Dayan, A. Pe’er, A.A. Friesem and Y. Silberberg, Phys. Rev. Lett. 94, 043602 (2005)

  19. Shaping of Entangeled Photons SLM Computer Beam dump IR detector Pump532nm Fourier plane SPCM Down-converting crystal up-converting crystal

  20. Temporal shaping of the two-photon wavefunction "Temporal Shaping of Entangled Photons", A. Pe’er, B. Dayan, A.A. Friesem and Y. Silberberg, Phys. Rev. Lett. 94, 073601 (2005)

  21. We have seen… Pulse Shaping • Control of HOM interference • Shaping of two-photon correlation functions Nonlinear interactions • Linear SFG for low light levels • SFG as coincidence detection Pulse shaping offers a new tool for quantum information

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