quantum sensor utilizes properties of quantum mechanics, such as quantum entanglement, quantum interference, and quantum state squeezing, which have optimized precision and beat current limits in sensor technology.

1. Quantum Sensor
L.R.S.D.Rathnayake

2. Quantum
Sensor
Quantum
Sensing
Historical Examples
Magnetometers based on super
conducting quantum interference
devices
Atomic Vapors or atomic clocks
Most Common platforms
Spin Qubits
Trapped Ions
Flux qubits

3. The quantum system has discrete,
resolvable energy levels
Assume : Two-level system
It must be possible to
initialize the quantum
system into a well-known state
and to read out its state
The quantum system can be
coherently manipulated,
typically by
time-dependent
fields
Quantum
Sensor
To
Function as a
The quantum system can
be interact with a relevant
physical quantity.
The interaction is quantified
by a coupling or transduction
parameter
(Transition Energy)
transition energy E external parameter

4. Quantum
Sensing
Type III
Use of quantum entanglement to improve the sensitivity or precision of a
measurement, beyond what is possible classically.
Type I
Use of a quantum object to measure a physical
quantity (classical or quantum).
EX: electronic, magnetic or vibrational states of superconducting or
spin qubits, neutral atoms, or trapped ions.
Type II
Use of quantum coherence (i.e., wavelike spatial or
temporal superposition states) to measure a physical quantity.
Use to describe

5. Basic Methodology for Performing Measurements
with Quantum Sensors
sensor
initialization
Interaction
with the
signal
sensor readout,
and signal
estimation
1
2
3

6. 1. Initialized into a known basis state
The quantum sensor is
2. Transformed into the desired initial sensing state
3. Evolves under the Hamiltonian for a time period.
(There the sensor is in the final sensing state)
4. Transformed into a superposition of observable
readout states
5. The final state of the quantum sensor is read out
and assume that the readout is projective.
(The binary answer - a physical quantity - Ex: a voltage,
current, photon count, or polarization)
6. Repeat many times in order to gain a precise
estimate for probability
7. The transition probability is measured as a function
of time and the physical quantity signal is inferred
from the data record using a suitable procedure

7. Experimental implementations of quantum sensors

9. LI-190R
Quantum Sensor
LI-9005 R
Quantum Sensor
Measures
Photo-synthetically Active Radiation
• Greenhouses, under plant canopies,
or in growth chambers
• For most broad-spectrum light sources,
including natural sunlight, artificial, or mixed sources

10. References
Wikipedia
Online @ https://en.wikipedia.org/wiki/Quantum_sensor
Quantum sensing
(published 25 July 2017) C. L. Degen*
Department of Physics, ETH Zurich, Otto Stern Weg 1, 8093 Zurich,
Switzerland

11. Thank You !