Quantum Lunch Location:
T-Division Conference Room, TA-3,
Building 123, Room 121
Quantum Institute: Visitor Schedule
The Quantum Lunch is regularly held on Thursdays in the Theoretical Division Conference Room, TA-3, Building 123, Room 121.
For more information, contact Diego Dalvit.
Thursday, December 11, 2008
12:30 PM - 2:00 PM
Speaker: William Wootters, Williams College
Technical Host: Wojciech Zurek
TOPIC: The Entanglement Cost of a Nonlocal Measurement
For a joint measurement on a pair of spatially separated quantum objects, one can ask how
much entanglement is needed to carry out the measurement exactly, using only local operations
and classical communication. In this talk I focus on a particular orthogonal measurement on
two qubits with partially entangled eigenstates, for which we can find upper and lower bounds
on the entanglement cost. The lower bound implies that the entanglement required to perform
the measurement is strictly greater than the average entanglement of the eigenstates. I also
consider a closely related eight-outcome measurement for which we can compute the cost
exactly. Even though these two measurements are very similar, their costs are quite different,
raising a question as to what characteristics of the relationships among the states of a quantum
measurement determine its cost.