Multiport for high-dimensional quantum states using structured photons (Conference Presentation)

2020 ◽  
Author(s):  
Robert Fickler ◽  
Markus Hiekkamäki ◽  
Florian Brandt ◽  
Frederic Bouchard ◽  
Shashi Prabhakar ◽  
...  
Keyword(s):  
Quantum States ◽  
High Dimensional

scholarly journals Path-encoded high-dimensional quantum communication over a 2-km multicore fiber

2021 ◽  
Vol 7 (1) ◽  
Author(s):  
Beatrice Da Lio ◽  
Daniele Cozzolino ◽  
Nicola Biagi ◽  
Yunhong Ding ◽  
Karsten Rottwitt ◽  
...  
Keyword(s):  
Quantum Key Distribution ◽  
Quantum Communication ◽  
Error Rates ◽  
Quantum States ◽  
High Dimensional ◽  
Secret Key ◽  
System A ◽  
Reliable Transmission ◽  
Multicore Fiber ◽  
Interferometric Detection

AbstractQuantum key distribution (QKD) protocols based on high-dimensional quantum states have shown the route to increase the key rate generation while benefiting of enhanced error tolerance, thus overcoming the limitations of two-dimensional QKD protocols. Nonetheless, the reliable transmission through fiber links of high-dimensional quantum states remains an open challenge that must be addressed to boost their application. Here, we demonstrate the reliable transmission over a 2-km-long multicore fiber of path-encoded high-dimensional quantum states. Leveraging on a phase-locked loop system, a stable interferometric detection is guaranteed, allowing for low error rates and the generation of 6.3 Mbit/s of a secret key rate.

High-dimensional quantum state manipulation and tracking

2020 ◽  
pp. 2050045
Author(s):  
Mevludin Licina
Keyword(s):  
Probability Distribution ◽  
Quantum State ◽  
Critical Points ◽  
Theoretical Framework ◽  
Quantum Systems ◽  
Quantum States ◽  
High Dimensional ◽  
Quantum Topology ◽  
Mathematical Representations ◽  
Framework Approach

Dynamical high-dimensional quantum states can be tracked and manipulated in many cases. Using a new theoretical framework approach of manipulating quantum systems, we will show how one can manipulate and introduce parameters that allow tracking and descriptive insight in the dynamics of states. Using quantum topology and other novel mathematical representations, we will show how quantum states behave in critical points when the shift of probability distribution introduces changes.

Generation and manipulation of high dimensional quantum states of light with AlGaAs chips (Conference Presentation)

2020 ◽  
Author(s):  
Saverio Francesconi ◽  
Giorgio Maltese ◽  
Felicien Appas ◽  
Arnault Raymond ◽  
Aristide Lemaître ◽  
...  
Keyword(s):  
Quantum States ◽  
High Dimensional

scholarly journals Device-independent certification of tensor products of quantum states using single-copy self-testing protocols

Quantum ◽  
2021 ◽  
Vol 5 ◽  
pp. 418
Author(s):  
Ivan Šupić ◽  
Daniel Cavalcanti ◽  
Joseph Bowles
Keyword(s):  
Tensor Product ◽  
Single Copy ◽  
Quantum States ◽  
High Dimensional ◽  
Entangled States ◽  
Testing Protocol ◽  
Self Testing ◽  
Rank One ◽  
Number Of Parties ◽  
Testing Protocols

Self-testing protocols are methods to determine the presence of shared entangled states in a device independent scenario, where no assumptions on the measurements involved in the protocol are made. A particular type of self-testing protocol, called parallel self-testing, can certify the presence of copies of a state, however such protocols typically suffer from the problem of requiring a number of measurements that increases with respect to the number of copies one aims to certify. Here we propose a procedure to transform single-copy self-testing protocols into a procedure that certifies the tensor product of an arbitrary number of (not necessarily equal) quantum states, without increasing the number of parties or measurement choices. Moreover, we prove that self-testing protocols that certify a state and rank-one measurements can always be parallelized to certify many copies of the state. Our results suggest a method to achieve device-independent unbounded randomness expansion with high-dimensional quantum states.

scholarly journals Discrimination and synthesis of recursive quantum states in high-dimensional Hilbert spaces

2015 ◽  
Vol 91 (4) ◽  
Author(s):  
David S. Simon ◽  
Casey A. Fitzpatrick ◽  
Alexander V. Sergienko
Keyword(s):  
Hilbert Spaces ◽  
Quantum States ◽  
High Dimensional

Measuring Orbital Angular Momentum Quantum States in High-Dimensional Mutually Unbiased Bases

2013 ◽  
Author(s):  
Daniel Giovannini ◽  
Jacqui Romero ◽  
Jonathan Leach ◽  
Angela Dudley ◽  
Andrew Forbes ◽  
...  
Keyword(s):  
Angular Momentum ◽  
Orbital Angular Momentum ◽  
Quantum States ◽  
High Dimensional ◽  
Mutually Unbiased Bases

scholarly journals On-chip generation of high-dimensional entangled quantum states and their coherent control

Nature ◽  
2017 ◽  
Vol 546 (7660) ◽  
pp. 622-626 ◽  
Author(s):  
Michael Kues ◽  
Christian Reimer ◽  
Piotr Roztocki ◽  
Luis Romero Cortés ◽  
Stefania Sciara ◽  
...  
Keyword(s):  
Coherent Control ◽  
Quantum States ◽  
High Dimensional ◽  
Entangled Quantum States ◽  
On Chip

ENTANGLEMENT OF FORMATION FOR A CLASS OF SPECIAL QUANTUM STATES

2007 ◽  
Vol 05 (03) ◽  
pp. 343-352 ◽  
Author(s):  
HUI ZHAO ◽  
ZHI-XI WANG
Keyword(s):  
Lower Bound ◽  
Large Class ◽  
Special Kind ◽  
Quantum States ◽  
The Other ◽  
High Dimensional ◽  
Entangled States ◽  
Mixed States ◽  
Density Matrices ◽  
Entanglement Of Formation

The entanglement of formation for a class of high-dimensional quantum mixed states is investigated. A special kind of D-computable states is defined and the lower bound of entanglement of formation for a large class of density matrices whose decompositions lie in these D-computable quantum states is obtained. Moreover we present a kind of construction for this special state which is defined by a class of special matrices with two non-zero different eigenvalues and the other eigenvalues are zero. Making use of the D-computable we construct a class of bound entangled states.

scholarly journals Unconditionally secure quantum bit commitment based on the uncertainty principle

2019 ◽  
Vol 475 (2222) ◽  
pp. 20180543 ◽  
Author(s):  
Guang Ping He
Keyword(s):  
Uncertainty Principle ◽  
Quantum States ◽  
High Dimensional ◽  
Subtle Difference ◽  
Quantum Bit ◽  
Bit Commitment ◽  
Quantum Steering ◽  
Attack Strategy

Unconditionally secure quantum bit commitment (QBC) was considered impossible. But the no-go proofs are based on the Hughston–Jozsa–Wootters (HJW) theorem (a.k.a. the Uhlmann theorem). Recently, it was found that in high-dimensional systems, there exist some states which can display a chaos effect in quantum steering, so that the attack strategy based on the HJW theorem has to require the capability of discriminating quantum states with very subtle difference, to the extent that is not allowed by the uncertainty principle. With the help of this finding, here we propose a simple QBC protocol which manages to evade the no-go proofs.

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