TY - JOUR
T1 - Bounds on quantum communication via Newtonian gravity
JF - New Journal of Physics
Y1 - 2015
A1 - D. Kafri
A1 - G. J. Milburn
A1 - J. M. Taylor
AB - Newtonian 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.
VL - 17
U4 - 015006
UR - http://arxiv.org/abs/1404.3214v2
CP - 1
J1 - New J. Phys.
U5 - 10.1088/1367-2630/17/1/015006
ER -
TY - JOUR
T1 - A classical channel model for gravitational decoherence
JF - New Journal of Physics
Y1 - 2014
A1 - D. Kafri
A1 - J. M. Taylor
A1 - G. J. Milburn
AB - We 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.
VL - 16
U4 - 065020
UR - http://arxiv.org/abs/1401.0946v1
CP - 6
J1 - New J. Phys.
U5 - 10.1088/1367-2630/16/6/065020
ER -
TY - JOUR
T1 - Quantum interface between an electrical circuit and a single atom
JF - Physical Review Letters
Y1 - 2012
A1 - D. Kielpinski
A1 - D. Kafri
A1 - M. J. Woolley
A1 - G. J. Milburn
A1 - J. M. Taylor
AB - We 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.
VL - 108
UR - http://arxiv.org/abs/1111.5999v1
CP - 13
J1 - Phys. Rev. Lett.
U5 - 10.1103/PhysRevLett.108.130504
ER -