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Preparation of polarization-entangled mixed states of two photons
| Content Provider | Semantic Scholar |
|---|---|
| Author | Zhang, Chuanwei |
| Copyright Year | 2004 |
| Abstract | ry Entanglement has played a crucial role for many appli tions of quantum information, such as quantum teleporta @1#, superdense coding @2#, quantum error correction @3#, etc. To function optimally these applications require maxim pure entanglement. However, unwanted coupling to the vironment causes decoherence of quantum systems yields mixed state entanglement. Therefore entanglem concentration@4–8# and various applications of mixed sta entanglement@9–11# are very important and have been i vestigated by many authors. Experimentally, a special mi state, ‘‘decoherence-free subspace’’ @12#, has been demon strated and optical Werner states have been prepared @13#. In this paper, we propose a scheme for preparing arbit polarization-entangled mixed states of two photons via c trolled decoherence. In the experiment of demonstra decoherence-free subspace, decoherence was impose coupling polarization modes to frequency modes of photo Here we introduce decoherence by entangling polariza modes with location modes of photons, where locat modes are finally traced out by mixing them with appropri path-length differences and detecting coincidences inde dent of the emission of photon pair from photon source. Consider a two-qubit mixed state r of quantum system AB. It can be represented as @14# |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://www.utdallas.edu/~cxz124830/article/PRA-2004.pdf |
| Language | English |
| Access Restriction | Open |
| Subject Keyword | Experiment Line Printer Daemon protocol Photons Polarization (waves) Preparation Quantum decoherence Quantum entanglement Quantum error correction Quantum information Quantum state Quantum system Qubit Sensor Superdense coding |
| Content Type | Text |
| Resource Type | Article |
