01241nas a2200157 4500008004100000245005800041210005800099260001500157300001100172490000700183520080300190100001400993700002001007700001901027856003701046 2015 eng d00aBounds on quantum communication via Newtonian gravity0 aBounds on quantum communication via Newtonian gravity c2015/01/15 a0150060 v173 aNewtonian gravity yields specific observable consequences, the most striking of which is the emergence of a $1/r^2$ force. In so far as communication can arise via such interactions between distant particles, we can ask what would be expected for a theory of gravity that only allows classical communication. Many heuristic suggestions for gravity-induced decoherence have this restriction implicitly or explicitly in their construction. Here we show that communication via a $1/r^2$ force has a minimum noise induced in the system when the communication cannot convey quantum information, in a continuous time analogue to Bell's inequalities. Our derived noise bounds provide tight constraints from current experimental results on any theory of gravity that does not allow quantum communication.
1 aKafri, D.1 aMilburn, G., J.1 aTaylor, J., M. uhttp://arxiv.org/abs/1404.3214v201005nas a2200157 4500008004100000245006000041210005800101260001500159300001100174490000700185520056500192100001400757700001900771700002000790856003700810 2014 eng d00aA classical channel model for gravitational decoherence0 aclassical channel model for gravitational decoherence c2014/06/26 a0650200 v163 aWe show that, by treating the gravitational interaction between two mechanical resonators as a classical measurement channel, a gravitational decoherence model results that is equivalent to a model first proposed by Diosi. The resulting decoherence model implies that the classically mediated gravitational interaction between two gravitationally coupled resonators cannot create entanglement. The gravitational decoherence rate ( and the complementary heating rate) is of the order of the gravitationally induced normal mode splitting of the two resonators.
1 aKafri, D.1 aTaylor, J., M.1 aMilburn, G., J. uhttp://arxiv.org/abs/1401.0946v101226nas a2200169 4500008004100000245007000041210006900111260001400180490000800194520072500202100001900927700001400946700002000960700002000980700001901000856003701019 2012 eng d00aQuantum interface between an electrical circuit and a single atom0 aQuantum interface between an electrical circuit and a single ato c2012/3/300 v1083 aWe show how to bridge the divide between atomic systems and electronic devices by engineering a coupling between the motion of a single ion and the quantized electric field of a resonant circuit. Our method can be used to couple the internal state of an ion to the quantized circuit with the same speed as the internal-state coupling between two ions. All the well-known quantum information protocols linking ion internal and motional states can be converted to protocols between circuit photons and ion internal states. Our results enable quantum interfaces between solid state qubits, atomic qubits, and light, and lay the groundwork for a direct quantum connection between electrical and atomic metrology standards.
1 aKielpinski, D.1 aKafri, D.1 aWoolley, M., J.1 aMilburn, G., J.1 aTaylor, J., M. uhttp://arxiv.org/abs/1111.5999v1