Purdue University Spring 2014 Prof. Yong P. Chen Lecture 10 (2/16/2014) Slide Introduction to Quantum Optics.

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Presentation transcript:

Purdue University Spring 2014 Prof. Yong P. Chen Lecture 10 (2/16/2014) Slide Introduction to Quantum Optics & Quantum Photonics PHYS522 ECE695 (“Coherent Optics & Quantum Electronics”) Lecture 10 Quantum Optics of Photons 1 Reminder: Lecture notes taker Seminar Friday Next week lecture: Monday by Prof. Elliott (Chap5-6); Wednesday by David Blasing (Chap 9, light-atom) HWK3 due in 2 weeks, see online

Purdue University Spring 2014 Prof. Yong P. Chen Lecture 10 (2/16/2014) Slide Introduction to Quantum Optics & Quantum Photonics PHYS522 ECE695 (“Coherent Optics & Quantum Electronics”) Course Outline Part 1: basic review: Optics+Quantum; Part 2: Basic Light- matter interaction; laser; Part 3: Quantum Optics of photons Part 4: More advanced light-matter interaction Part 5: Quantum information/photonics/ applications Subject to change; Check updates on course web/wiki

Purdue University Spring 2014 Prof. Yong P. Chen Lecture 10 (2/16/2014) Slide Introduction to Quantum Optics & Quantum Photonics PHYS522 ECE695 (“Coherent Optics & Quantum Electronics”) Quantum Optics of Photons FQ’Chap5 Chap 7-8: coherent, squeezed, & number states FQ’Chap6

Purdue University Spring 2014 Prof. Yong P. Chen Lecture 10 (2/16/2014) Slide Introduction to Quantum Optics & Quantum Photonics PHYS522 ECE695 (“Coherent Optics & Quantum Electronics”) Photon Statistics FQ’Chap5 Single photon detector: PMT (photomultiplier tube) APD (avalanche photodiode)

Purdue University Spring 2014 Prof. Yong P. Chen Lecture 10 (2/16/2014) Slide Introduction to Quantum Optics & Quantum Photonics PHYS522 ECE695 (“Coherent Optics & Quantum Electronics”) How many photons (detected)?

Purdue University Spring 2014 Prof. Yong P. Chen Lecture 10 (2/16/2014) Slide Introduction to Quantum Optics & Quantum Photonics PHYS522 ECE695 (“Coherent Optics & Quantum Electronics”) Coherent Light: Poisson Photon Statistics

Purdue University Spring 2014 Prof. Yong P. Chen Lecture 10 (2/16/2014) Slide Introduction to Quantum Optics & Quantum Photonics PHYS522 ECE695 (“Coherent Optics & Quantum Electronics”)

Purdue University Spring 2014 Prof. Yong P. Chen Lecture 10 (2/16/2014) Slide Introduction to Quantum Optics & Quantum Photonics PHYS522 ECE695 (“Coherent Optics & Quantum Electronics”) Classification of Light by Photon Statistics (Nonclassical light)

Purdue University Spring 2014 Prof. Yong P. Chen Lecture 10 (2/16/2014) Slide Introduction to Quantum Optics & Quantum Photonics PHYS522 ECE695 (“Coherent Optics & Quantum Electronics”) Superpoissonian Light 1) Thermal Light (blackbody) Classical (Rayleigh-Jeans) Planck (quantum):

Purdue University Spring 2014 Prof. Yong P. Chen Lecture 10 (2/16/2014) Slide Introduction to Quantum Optics & Quantum Photonics PHYS522 ECE695 (“Coherent Optics & Quantum Electronics”) (focus on one mode) Particle (Photon) “wave noise”

Purdue University Spring 2014 Prof. Yong P. Chen Lecture 10 (2/16/2014) Slide Introduction to Quantum Optics & Quantum Photonics PHYS522 ECE695 (“Coherent Optics & Quantum Electronics”) (Superpoissonian) 2. “Chaotic” (partially coherent light) Measurement time T (smaller) vs.  c

Purdue University Spring 2014 Prof. Yong P. Chen Lecture 10 (2/16/2014) Slide Introduction to Quantum Optics & Quantum Photonics PHYS522 ECE695 (“Coherent Optics & Quantum Electronics”) Subpoissonian Light But: any (random) loss will randomize the photons (det. Subpoissonian challenging)

Purdue University Spring 2014 Prof. Yong P. Chen Lecture 10 (2/16/2014) Slide Introduction to Quantum Optics & Quantum Photonics PHYS522 ECE695 (“Coherent Optics & Quantum Electronics”)

Purdue University Spring 2014 Prof. Yong P. Chen Lecture 10 (2/16/2014) Slide Introduction to Quantum Optics & Quantum Photonics PHYS522 ECE695 (“Coherent Optics & Quantum Electronics”) (single photon) photodetector PMT APD

Purdue University Spring 2014 Prof. Yong P. Chen Lecture 10 (2/16/2014) Slide Introduction to Quantum Optics & Quantum Photonics PHYS522 ECE695 (“Coherent Optics & Quantum Electronics”) Theory of Photodetection (semiclasical) If I(t)=I constant If I(t) fluctuating, superpoissonian

Purdue University Spring 2014 Prof. Yong P. Chen Lecture 10 (2/16/2014) Slide Introduction to Quantum Optics & Quantum Photonics PHYS522 ECE695 (“Coherent Optics & Quantum Electronics”) Theory of Photodetection (quantum) But: any (random) loss will randomize the photons (det. Subpoissonian challenging) Key: high Q.E.

Purdue University Spring 2014 Prof. Yong P. Chen Lecture 10 (2/16/2014) Slide Introduction to Quantum Optics & Quantum Photonics PHYS522 ECE695 (“Coherent Optics & Quantum Electronics”) Next Lecture (10): quantum optics of photons FQ Chap 5.