منابع مشابه
Reference frame agreement in quantum networks
Quantum theory uses physical properties such as momentum, position, phase, or time to encode information. These properties are not absolute, but relative to a reference frame. When several parties need to communicate quantum information a shared reference frame between all the parties is very handy. Even though some tasks can be done without, sharing a common reference frame is an important too...
متن کاملDynamics of a Quantum Reference Frame
We analyze a quantum mechanical gyroscope, which is modeled as a large spin and used as a reference against which to measure the angular momenta of spin-1/2 particles. These measurements induce a back-action on the reference which is the central focus of our study. We begin by deriving explicit expressions for the quantum channel representing the back-action. Then, we analyze the dynamics incur...
متن کاملDegradation of a quantum reference frame
Stephen D. Bartlett, Terry Rudolph, 3 Robert W. Spekkens, and Peter S. Turner School of Physics, The University of Sydney, Sydney, New South Wales 2006, Australia Optics Section, Blackett Laboratory, Imperial College London, London SW7 2BZ, United Kingdom Institute for Mathematical Sciences, Imperial College London, London SW7 2BW, United Kingdom Department of Applied Mathematics and Theoretica...
متن کاملTight Reference Frame-Independent Quantum Teleportation
We give a tight scheme for teleporting a quantum state between two parties whose reference frames are misaligned by an action of a finite symmetry group. Unlike previously proposed schemes, ours requires no additional tokens or data to be passed between the participants; the same amount of classical information is transferred as for ordinary quantum teleportation, and the Hilbert space of the e...
متن کاملSecret quantum communication of a reference frame.
We propose quantum-cryptographic protocols to secretly communicate a reference frame--unspeakable information in the sense it cannot be encoded into a string of bits. Two distant parties can secretly align their Cartesian axes by exchanging N spin-1/2 particles, achieving the optimal accuracy 1/N. A possible eavesdropper cannot gain any information without being detected.
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ژورنال
عنوان ژورنال: Classical and Quantum Gravity
سال: 2011
ISSN: 0264-9381,1361-6382
DOI: 10.1088/0264-9381/28/22/225014