{"147531":{"#nid":"147531","#data":{"type":"event","title":"School of Physics Hard Condensed Matter and AMO Seminar with Johannes Otterbach","body":[{"value":"\u003Cp\u003EThe recent advance in coherently controlling and manipulating strong, long-range Rydberg interactions has triggered extensive research in studying interesting many-body effects as, e.g. the use of Rydberg blockade effects for quantum information processing and crystal formation. In this talk I show that Rydberg interactions can be used to alter the photon statistics of a weak probe field after propagating in a coherently prepared atomic Rydberg gas under conditions of Electromagnetically Induced Transparency (EIT).\u003C\/p\u003E\u003Cp\u003EThe Rydberg blockade mechanism leads to an effective two-level physics when two photons are separated by less than the blockade radius resulting in a strong anti-correlation of two photons given by an avoided volume. For large separations the repulsive long-range interaction between the Rydberg atoms induces repulsive interactions between the photons leading to quasi-crystalline states of photons. Confining the system to one dimension the low-energy physics of the excitations can be described in terms of a Luttinger Liquid.\u003C\/p\u003E\u003Cp\u003EUsing DMRG simulations the Luttinger K-parameter is calculated and conditions on the formation of long-range ordered states are derived. Implications of the formation of such hard-sphere photons for the recent experiment of Pritchard et al. [Phys. Rev. Lett. 105, 193603 (2010)] and the observation of long-range correlations in future experiments will be discussed.\u003C\/p\u003E","summary":null,"format":"limited_html"}],"field_subtitle":"","field_summary":[{"value":"\u003Cp\u003ESlow Light in Cold Rydberg Gases\u003C\/p\u003E","format":"limited_html"}],"field_summary_sentence":[{"value":"Slow Light in Cold Rydberg Gases"}],"uid":"27664","created_gmt":"2012-08-20 10:18:17","changed_gmt":"2016-10-08 01:59:28","author":"Alison Morain","boilerplate_text":"","field_publication":"","field_article_url":"","field_event_time":{"event_time_start":"2012-08-30T13:00:00-04:00","event_time_end":"2012-08-30T14:00:00-04:00","event_time_end_last":"2012-08-30T14:00:00-04:00","gmt_time_start":"2012-08-30 17:00:00","gmt_time_end":"2012-08-30 18:00:00","gmt_time_end_last":"2012-08-30 18:00:00","rrule":null,"timezone":"America\/New_York"},"extras":[],"related_links":[{"url":"http:\/\/www.physics.gatech.edu\/seminars-colloquia\/series\/hard-condensed-matter-and-atomic-molecular-optical\/johannes-otterbach-2012","title":"http:\/\/www.physics.gatech.edu\/seminars-colloquia\/series\/hard-condensed-matt..."}],"groups":[{"id":"126011","name":"School of Physics"}],"categories":[],"keywords":[],"core_research_areas":[],"news_room_topics":[],"event_categories":[{"id":"1795","name":"Seminar\/Lecture\/Colloquium"}],"invited_audience":[],"affiliations":[],"classification":[],"areas_of_expertise":[],"news_and_recent_appearances":[],"phone":[],"contact":[{"value":"\u003Cp\u003EHost: Francesco Bariani - \u003Ca href=\u0022mailto:francesco.bariani@physics.gatech.edu\u0022\u003Efrancesco.bariani@physics.gatech.edu\u003C\/a\u003E\u003C\/p\u003E\u003Cp\u003ECoordinator: Alison Morain - \u003Ca href=\u0022mailto:Alison.morain@physics.gatech.edu\u0022\u003EAlison.morain@physics.gatech.edu\u003C\/a\u003E\u003C\/p\u003E","format":"limited_html"}],"email":[],"slides":[],"orientation":[],"userdata":""}}}