US 2018/0003931 A1Published application

Cavity and quantum computer

AssigneeKabushiki Kaisha Toshiba

InventorsSatoshi NAKAMURA, Kouichi ICHIMURA

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Abstract

According to one embodiment, a cavity with a cavity mode which is coupled to physical systems includes a spherical mirror and a plane mirror. The spherical mirror is provided at a birefringent crystal including the physical systems. The plane mirror is provided at the birefringent crystal opposite to the spherical mirror. The birefringent crystal has a first refractive index to light polarized in a first direction parallel to a polarization direction of the cavity mode on an optical axis of the cavity and a second refractive index to light polarized in a second direction parallel to the optical axis, the second refractive index being different from the first refractive index. A cavity length of the cavity and a mode waist radius of the cavity mode satisfy a specific condition.

Claims6

Dependent claims

A cavity with a cavity mode which is coupled to physical systems, the cavity comprising:

a spherical mirror provided at a birefringent crystal including the physical systems;
and
a plane mirror provided at the birefringent crystal and opposed to the spherical mirror,
wherein the birefringent crystal has a first refractive index to light polarized in a first direction parallel to a polarization direction of the cavity mode on an optical axis of the cavity and a second refractive index to light polarized in a second direction parallel to the optical axis, the second refractive index being different from the first refractive index, and
a following expression is satisfied:
l1−<l<l1+
where l1− and l1+ satisfy
l
1
-
3
-
(
3

l
R
5
l
0
2
+
l
R
2
-
3

l
R
2
)

l
1
-
-
3

l
R
4

A
2

ω
2
=
0


and
l
1
+
3
-
(
3

l
R
5
l
0
2
+
l
R
2
-
3

l
R
2
)

l
1
+
-
3

l
R
4

A
2

ω
2
=
0

in which lR=ω2πnz/λ and l0=lRL/A,
l is a cavity length of the cavity,
ω is a mode waist radius of the cavity mode,
L is a total loss per one reciprocation in the cavity,
A is a loss per one reciprocation in the cavity not dependent on the cavity length,
nz is the second refractive index, and
λ is a wavelength of light in the cavity mode.

101 more elements

Dependencies are inferred from the claim text.

Facts

Application: 15/442,939Filed 27 Feb 2017
Priority: JP 2016-13086030 Jun 2016
Published: 4 Jan 2018
Term ends: Not estimatedThe source records don’t support an estimate.

Classification11 codes

G02F 3/00
Optical logic elements
G02B 5/3083
Polarising elements: birefringent or phase retarding elements
G02B 17/004
Systems with reflecting surfaces, with or without refracting elements: systems comprising a plurality of reflections between two or more surfaces,…
G06N 10/40
Quantum computing, i.e. information processing based on quantum-mechanical phenomena: physical realisations or architectures of quantum processors…