Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quantum Clock Synchronization with one qubit   The clock synchronization problem is to determine the time difference T
between two spatially separated parties. We improve on I. Chuang's quantum
clock synchronization algorithm and show that it is possible to obtain T to n
bits of accuracy while communicating only one qubit in one direction and using
an O(2^n) frequency range. We also prove a quantum lower bound of \Omega(2^n)
for the product of the transmitted qubits and the range of frequencies, thus
showing that our algorithm is optimal.

30
The categories of this paper are: q-alg
34
The categories of this paper are: chem-ph
19
The categories of this paper are: eess
22
The categories of this paper are: chao-dyn
12
The categories of this paper are: nucl-th
35
The categories of this paper are: mtrl-th
27
The categories of this paper are: comp-gas
37
The categories of this paper are: supr-con
25
The categories of this paper are: patt-sol
16
The categories of this paper are: stat
2
The categories of this paper are: math
28
The categories of this paper are: alg-geom
0
The categories of this paper are: hep-ph
15
The categories of this paper are: nucl-ex
23
The categories of this paper are: solv-int
31
The categories of this paper are: ao-sci