Berkeley CSUA MOTD:Entry 21510
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2025/07/08 [General] UID:1000 Activity:popular
7/8     

2001/6/14-15 [Science/Physics, Computer/Theory] UID:21510 Activity:kinda low
6/13    Long lived quantum entanglement of 2 macroscopic objects has been
        achieved:
        http://xxx.lanl.gov/abs/quant-ph/0106057
        Food for thought.  -- ilyas
        \_ Thaumaturgy scheduled for teaching at UCB in year 2011
           \_ We will teleport your gonads into the icy environs of deep space!
        \_ Eh. Note that this has only been submitted to Nature and thus hasn't
           passed peer review yet. The results they claim do sound impressive,
           but I'm holding off on the party for time being (and I'm not nearly
           enough of a physicist to evaluate actual procedure used and the
           consequent claims' validity). -alexf
        \_ .5 milli seconds is longlived? not useful for engineers yet..
           \_ for quantum computation, that is wuite long.  If you could
              get that kind of lifetime for a 10,000 qubit system,
              you would have a real quantum computer.
              \_ Even 200-300 qubits at that speed should kick the crap out
                 of the current state of classical machines. -alexf
        \_ 0.5 ms is long for all scientist/engineers.
           \_ that's not what their sexual partners think.
2025/07/08 [General] UID:1000 Activity:popular
7/8     

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Cache (1123 bytes)
xxx.lanl.gov/abs/quant-ph/0106057
Polzik Comments: Submitted to Nature, June 9, 2001, 11 pages, 3 figures. Contents changed following referees' suggestions Entanglement is considered to be one of the most profound features of quantum mechanics. An entangled state of a system consisting of two subsystems cannot be described as a product of the quantum states of the two subsystems. In this sense the entangled system is considered inseparable and nonlocal. It is generally believed that entanglement manifests itself mostly in systems consisting of a small number of microscopic particles. Here we demonstrate experimentally the entanglement of two objects, each consisting of about 10^12 atoms. Entanglement is generated via interaction of the two objects - more precisely, two gas samples of cesium atoms - with a pulse of light, which performs a non-local Bell measurement on collective spins of the samples. Besides being of fundamental interest, the robust, long-lived entanglement of material objects demonstrated here is expected to be useful in quantum information processing, including teleportation of quantum states of matter and quantum memory.