Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Multi-mode Entanglement is Detrimental to Lossy Optical Quantum
  Metrology   In optical interferometry multi-mode entanglement is often assumed to be the
driving force behind quantum enhanced measurements. Recent work has shown this
assumption to be false: single mode quantum states perform just as well as
their multi-mode entangled counterparts. We go beyond this to show that when
photon losses occur - an inevitability in any realistic system - multi-mode
entanglement is actually detrimental to obtaining quantum enhanced
measurements. We specifically apply this idea to a superposition of coherent
states, demonstrating that these states show a robustness to loss that allows
them to significantly outperform their competitors in realistic systems. A
practically viable measurement scheme is then presented that allows
measurements close to the theoretical bound, even with loss. These results
promote a new way of approaching optical quantum metrology using single-mode
states that we expect to have great implications for the future.

8
The categories of this paper are: hep-ex
24
The categories of this paper are: dg-ga
11
The categories of this paper are: hep-lat
9
The categories of this paper are: nlin
21
The categories of this paper are: adap-org
3
The categories of this paper are: physics
10
The categories of this paper are: q-bio
12
The categories of this paper are: nucl-th
15
The categories of this paper are: nucl-ex
20
The categories of this paper are: acc-phys
35
The categories of this paper are: mtrl-th
19
The categories of this paper are: eess
1
The categories of this paper are: cs
34
The categories of this paper are: chem-ph
23
The categories of this paper are: solv-int
4
The categories of this paper are: cond-mat