On the practicality of time-optimal two-qubit Hamiltonian simulation

Details On the practicality of time-optimal two-qubit Hamiltonian simulation On the practicality of time-optimal two-qubit Hamiltonian simulation

2003-03-11

arxiv.org/abs/quant-ph/0303070v1

Phys. Rev. A 68, 042303 (2003)

Physics

Quantum Physics

9 pages, 2 figures

Scientific paper

10.1103/PhysRevA.68.042303

What is the time-optimal way of using a set of control Hamiltonians to obtain a desired interaction? Vidal, Hammerer and Cirac [Phys. Rev. Lett. 88 (2002) 237902] have obtained a set of powerful results characterizing the time-optimal simulation of a two-qubit quantum gate using a fixed interaction Hamiltonian and fast local control over the individual qubits. How practically useful are these results? We prove that there are two-qubit Hamiltonians such that time-optimal simulation requires infinitely many steps of evolution, each infinitesimally small, and thus is physically impractical. A procedure is given to determine which two-qubit Hamiltonians have this property, and we show that almost all Hamiltonians do. Finally, we determine some bounds on the penalty that must be paid in the simulation time if the number of steps is fixed at a finite number, and show that the cost in simulation time is not too great.

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